YouTube is the only platform that I don't think I'll be able to quit any time soon. Hosting video on that kind of scale requires insane amounts of capitol, and P2P isn't reliable enough, and I say this as someone who has streamed torrents before and has tried out PeerTube.
Also even if there was an alternative, having an alternative for creator monitization is even more difficult. LBRY and D-Tube tried to do it with cryptocurrency, but both of those projects seem to have fizzled out (and I think one is flooded with fascists nowadays).
If it's just watching there's plenty of alternatives. Newpipe and YMusic on Android are pretty awesome. Also there's Freetube on desktop and Invidious.
Tbf under quitting i understand not interacting with the platform anymore in any way. Just using a different app for that platform isnt really quitting. I still use reddit with a modded 3rd party app so it still works since i never really got into lemmy or kbin (i'm here after months of not opening it just to look what changed) so while i dont use the official way of accessing it i cannot say i quit
I set up a firefox shortcut for my instance with keyword "r" so that if I type "r+enter" I get startrek.website. Putting that unwanted muscle memory to good use.
Man, this is one I am on the way out of. Late, I know. But I genuinely keep up with friends and family there, also facebook marketplace has taken over the game.