Okay, if you like Steam and Proton, try the Heroic Games Launcher and Lutris.
Both allow you to play non-Linux games via Wine.

Lutris already has user-built configs and a lot of built-in shops which is great.

And Heroic allows you to install games from gog and Epic with Wine or Proton. There you have to do a little bit of trial and error but can get games you otherwise wouldn't easily be able to play.