It could be the proton version, when i started gamming on linux with steam i used the custom proton GE from flatpak and it worked better then any version, nowadays the proton experimental also seems to be working even with more games supporting it but the custom version still has better performance in my machine.
As others have said use the Pop_OS! Nvidia ISO. Nvidia drivers are just problematic on Linux. There's a good chance your games will just work with that OS. It's also based off Ubuntu, so it has access to the same software repositories.
haven't seen anyone else mention it, but league is currently broken on Linux. you can see the status on this page or r/leagueoflinux
There are still a lot of games that don't work for me, even with Proton on Steam. Lutris has just straight up never worked for anything. Managed to get some going with the Heroic Games launcher, but not all. I think it's either a DirectX problem or something with the drivers. I'm not nearly techie enough to know how to even approach solving the problem, just maybe identifying it. I hope you figure it out so we can all get to playing our favorite games.
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