Open Source recommendations for someone trying to ditch iOS?

I probably can't get a new phone super soon, but it's been quite frustrating how little support there is for iOS versions of open source software I've been slowing moving towards or investigating. I absolutely get why though!

I have the capability to understand complex topics but it takes me quite a few tries to really get it, so I'd like some help or recommendations of things that aren't "just use linux". (I am slowly dipping my toes by using WSL for things, though.) I am always searching for software, but I've never been active enough in communities to ask for personal recommendations and be warned of short comings. Obviously if you find recommendations, they want to look the best to you and hide their faults. I do try and research as much as possible, but like I said, I can get confused or not understand the drawbacks or full level of manual work/environments needed to operate at times.

Mostly I'm looking for day to day things that I can operate from my windows computer, but can also connect to my phone, assuming I get an android next. (Librem phones looks cool, but switching carrier providers is not feasible for me at the moment.) The boring things, like calendar, email, notes (I do use obsidian already). But if you'd like to gush about your daily drivers, I'm all ears!