That's easy, just change the boot order so it defaults to Linux. If it's a pain to boot into Windows, you'll use it less and naturally replace your usage with Linux.
Try it for a week or two, you probably won't feel the need to go back. Make the switch today.
I haven't had any issues accessing NTFS from Linux, though running applications in Linux from NTFS is not a recipe for success. Only share data across OSes and everything should be fine.
Nah still doesn't work, lots of errors and poor performance, but that's probably because my OS is manjaro. I'm definetly going to switch to another distro, but don't know which one
I really like openSUSE Tumbleweed, it basically feels like a polished rolling release.
But what exactly are you trying to do? If you're using Steam, it just works. You can even add non-Steam games to Steam and use Proton with it. If you can't figure it out, post the issues you run into and surely someone will lend some tips.
Manjaro was my first distro, and I still have a soft spot for it despite its flaws, but I tend to think Garuda now does a better job filling the Manjaro niche in just about every way.
Despite what the OP of this thread said, I use proton through Lutris. I haven't used any other tool for this yet, though I hear heroic games launcher is good too.
I'm not looking at it right now, but on Lutris you can add a new game, say it should run under wine, and then pick one of the versions of wine with proton.