Unable to run anything that is not installed via Steam, please help. Tried everything.

Before anything I would like to inform that I am using linux for the first time, installed Bazzite on my rog ally handheld.

I have tried downloading games from Epic game& GOG via heroic launcher (Outer worlds, Mafia 3 definitive edition & fallout 3 goty) I also downloaded & tried a few GE proton versions. I have changed steam properties to all kinds of ge proton, experimental but all the time my games don't even load. Steam goes back from playing back to play. (Except with fallout where i got infinite steam loading screen).

I also installed battle net, the installation went correctly & battle net even launched but after adding battle net.exe to steam, setting proton experimental & using code WINE_SIMULATE_WRITECOPY=1 %command% I am back to nothing opening. Steam Simply shows playing for a second & goes back to play.

I have watched like 5 to 10 guides at this point. Followed everything, tried checking reddit. I'm lost guys.
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