Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

The steam deck is kinda inconvenient when any level of tinkering is required due to switching between game and desktop mode and the input if you dont attach a keyboard and mouse. Non-deck distros lose the quick settings which I really like.

Try bottles too. you may or may not find it easier than lutris. I find the dependencies easier to install. After checking if anyone has already documented what dependencies are needed (directx, dotnet, etc.), I usually start with the default wine bottles uses, then try wine-ge and tkg at least before giving up. I have yet to find a game that cant be made to work but other software can be very finicky especially once dotnet is involved.

I'm not sure what a good written guide for manually running linux games is off the top of my head, but generally yeah you install Lutris, install the latest Proton-GE version through e.g. ProtonUp-QT, create a game entry in Lutris with a "Prefix" location dedicated to your wine prefix, pick Proton-GE as the runner, copy the game into the generated prefix, target the normal EXE, and launch it. Sometimes if a game isn't launching you'll need to use "winetricks" to install vcrun2022 and dotnet48 dependencies into the wine prefix, since each Wine prefix is sort of like a copy of windows, and windows has a handful of dependencies that games sometimes rely on. I've heard you can also just add the game as a "non-steam game" to steam, but I've not bothered as Lutris gives more control. Again I can't vouch for any specific guides, but the keywords from this post should help target a general direction to move in.