Easy routine:

• Try a few different versions of Proton using force compatibility in game properties
• Turn off/on Steam Input
• Update Steam and my computer (or just restart if there's no updates)
• Check ProtonDB for any launch options. Try a few of them

Medium routine:

• Check if anyone has mentioned anything on Reddit or Steam Community. Try their fixes which usually involves more launch options and/or config file changes
• Try Proton GE (this is only so low because I usually don't have it installed and updated)
• Update graphics drivers
• Downgrade graphics drivers
• Try a different device

Last resort:

• Try Lutris or WineTricks with DLL override tricks
• Launch Steam using the terminal and actually debug the problem

Honestly I find that success rate is inversely proportional to amount of effort invested… so I just do the easy ones and give up if that doesn't work lol. 90% of the time it ends up working though from one of those easy things. But if you're truly desperate for a game to work and can't wait for Proton to fix it, the medium and hard options exist