With the advances in gaming on Linux in recent years, it is so tempting to switch full time. I would absolutely love to, but I am a Game Pass Ultimate subscriber and it is where I play a lot of my games on PC. I know you can use the cloud version, but I cannot stomach streaming games in their current state, so it is a no go. A large portion of my Steam library is compatible, but anytime I have done an install I end up giving in and going back to Windows for games.
If you must have Game Pass Ultimate to play games on PC, and must not use streaming, switching to Linux full time will probably never be possible.
I think that if you want to switch entirely, you will either have to accept that you can’t use Game Pass or get an Xbox to play those games. The more practical approach is probably to use Linux as much as you can, and reboot into Windows when there is a game you really want to play which isn’t available otherwise.