What are some good reasons to NOT end your own life?

You can't piss off the haters if you're dead.

Id rather die for something bigger than me and my mental anguish if im gonna knowingly off myself.
Ive lived through too much shit to make the weakness of the day take me out.
But I'll go when I wanna go too. But it'll be me saying "my time here is done" not in pain but acceptance and peace. Not despair.
Can't let that shit win.

My apartment will fine me if I don't bring the trash cans back inside before 9PM, so I gotta be alive for that.
- I'm glad I don't live in your complex!

You can always end it later, so stick around a little longer and see how things play out.
- Weaponized procrastination, I like it
- Everything ends and everything changes.
  Might as well see what will come your way.

I can tell you with absolute certainty that when it’s no longer a choice, you’ll want to be alive.
So don’t try to sudoku yaself. You would likely severely regret the decision as your life is ending.
Life can be really hard at times, but it can also be really good at times. Time is fleeting. Life is the good and the bad. Without the bad times, you wouldn’t be able to feel how good the good times are.
Whatever you’re going through, take care of yourself during this time, and you’ll come out okay.

this is what your enemies would like to see. don't have enemies? make some
- And make sure you're alive long enough to spit on their graves.

Food tastes good
Sunsets are awesome
Some people are worth being around
You might mess up the attempt and end up worse off than you are now
Religion might be right and you end up in the bad place
- Religion might be right and you end up in the bad place
  With modern life being as it is, we would be screwed either way in most religions. Everyone is probably breaking at least a couple of dozen rules in every religion.
  Even if you just need to follow a central "be kind"-rule - how kind is it to buy stuff on Amazon, packed and delivered by wage slaves, which was imported from China (which may include child or slave labour) [or some US states for that matter] while also hurting the environment in the process.
  There is no ethical consumption under capitalism. Thanks for coming to my TED talk.
  
  Literally the entire plot of The Good Place
  If anyone still haven't watched it, they should.
  BORTLES! 🍾🔥

My partner and dog would be sad.
I don't have nearly enough credit card debt to annoy the cc companies when I die

If you fail you'll live an infinitely worse life that isn't worth risking. And if you're going to make a rash decision then make one less rash like changing your entire name or applying to new jobs (amazon hires anyone) or dropping out of college

Life is experienced only by those who live it. The thing that keeps me not going through with it, is literally FOMO. As much as life is filled with things that suck, and things that I hate, I know there is the very real possibility that something new will come along that I will have regretted not getting to experience.
When I remember the things that I have experienced since the time I tried to kill myself I'm high school, I am glad I didn't. I would've regretted not making the new friends I did, and meeting the love of my life, and all of the the great times I've had, even though the shitty times that drove me to the edge, still persisted.
When I remember the things that I have experienced since the time I tried to kill myself in college, I am glad I didn't. I would've seriously regretted missing out on the freedom of independent living, and the parties with friends, and precious memories I've made in that time.
When I remembered the time I tried to kill myself after loosing my 3rd job in a row, and hanging on the edge of poverty for just one too many times, I'm glad I didn't. I would of seriously regretted missing out on buying my first house, and never getting to meet my baby girls.
When I think now, that life is shit, and not worth continuing, I remember those past times and know that it was impossible to know what could've been ahead of me, and how glad I am I stuck around to find out. So I keep on struggling through, because I know that there's bound to be some unkown thing, at some unknown time, that I will definitely want to be around to see.

Spite

To look out at the ocean, hear the waves and birds, walk barefoot on the grass, run naked in the rain, climb the mountain, unite with nature.

Losing someone to suicide sucks. I'm willing to bet there is at least one person in your life who would be sad (or perhaps devastated) if you suddenly died. Even if it means continuing on while unhappy, don't put that person through such an ordeal.
Depression is a temporary condition. It feels like it'll last forever and that life can never go back to the way it was, but that's not true. It might change you, and that change might be for the worse, but you can escape it. You can. It's hard, but it'll be worth once you're on the other side.
Start by seeking professional help. There are affordable (and, depending on your area, perhaps free) options out there. Then, change how your mind thinks. Don't let those thoughts rule you. Fight them! You can do it!
- The fact that you immediately jumped to depression seems like you didn't even think about the question.
  There is literally no reason to live, we've made that all up. That's not depression, that's reality. Pushing fundamental questions into a pathological corner is condescending.
  
  Call me crazy, but typically when someone asks for reasons to not kill themselves, depression is involved. Maybe OP was just starting conversation, but given the question and the increasing rate of people struggling with depression, I thought I'd offer my thoughts. I don't believe this answer was condescending.

spite

Do a jihad but instead of it being for something stupid, like religion, do it for a good cause. Like polar bears. Or owls. Or the poor.
- I have bad aim, both in video games and outside of video games...
  
  Who said anything about guns, or even violence?
  “Jihad” means “struggle.” Mohammed once said the most difficult jihad was the one against ourselves, e.g. the struggle to be better people.
  So a jihad for polar bears could mean throwing yourself into activism for the environment.

R. Buckminster Fuller asked that same question as he contemplated throwing himself into Lake Michigan. He was broke, in debt, jobless with a wife and small family.
The only thing he REALLY had was life insurance, which made him worth more dead than alive.
His experience is worth reading:
tl;dr - He made a wager with himself that there was some larger purpose to his life. He went on to hold 28 patents and became the inventor of the Geodesic Dome. Bucky Balls are named after him.
https://medium.com/@bbirdwell4711/why-buckminster-fuller-is-more-interesting-than-you-thought-f9d213eb0cb7
https://en.m.wikipedia.org/wiki/Buckminsterfullerene

It generates a ton of paperwork

If you die there is no chance at things getting better in your life here.
If you are alive even if that chance is small there is a chance at things getting better.

it's gonna happen anyway without even trying, and in the meantime I can do a whole bunch of interesting drugs.

5meoDMT. Do it first then decide.
- This but good ol fashion LSD and mushrooms
  
  Also get in (at least something close to) your peak shape and be lusty at least for awhile before you die. It's a trip.
- I honestly wouldn’t even know where to start with accessing DMT. I’m not OP and I’m not suicidal but I mean, where would I even start?

Rage.

Ammo is expensive and I can have more fun drinking and get the same result later down the road anyway

With the right attitude, you can find someone who will end it for you.
- Too depressed to become a revolutionary 😓

There are great cultural goods to be experienced. Also creating stuff feels good.

Because even when life throws you lemons you can still taste.

I have ten I could name and have named. The two that particularly would resonate with me are the idea I might still owe people things, there being less extreme ways of going about my issues, and the thought of what happens after death.

The one that kept me alive was that I couldn't make the world better for others, even in a small near-insignificant way, if I were dead. And it would be a bit pointless to die if everyone else is still going to live a life of suffering, especially as I can't be sure reincarnation isn't true.

- Why does this blank comment have 3 upvotes? 🤔

The only reason I haven't kicked it is because it would hurt people I love.
If there was some magical way to wipe the memory of my existence from all my friends and families minds I would be booking a first class ticket to hell immediately.
I've done pretty much everything I can reasonably do as someone in my tax bracket. All my other hopes and dreams cost too much and/or seem unlikely to happen at any point in the future so I may as well check out.
To be clear I am not actively suicidal right now, but I really think we ought to let people check out if they want to.
I didn't have a say in being brought into this world and it feels cruel to force people who don't wanna play anymore to stick around.

Me personally:
Un-alive over 9000 fascist's.

(Edit: Added spoiler, because I felt unsure if it is the right message)
- Do you assume a dead body has feelings?
  
  There is lot of pressure in situations of hopelessness and to make the decision to end one's life in an attempt to experience the alleviation of that pressure is futile, because there is no experience at all after death. So, for self-sympathetic reasons it is preferable to steady that grip on dear life as much possible.
  With help there can be a better understanding of the feelings of hopelessness, even or especially when those feelings have a very material foundation.