If they have good scores on protondb, it’s probably an issue with configuration. First, make sure you’re running it with proton. Go to the game’s configuration > compatibility and tick “force the use of a specific steam play compatibility tool.” then select the highest version of proton available(don’t choose experimental if your game is supported according to protondb). Then, click play. if needed, proton will install and this should solve your issue. If it doesn’t, then you can delete steam(sudo pacman -R steam), and remove the .steam folder in your home folder. This deletes your configuration for steam, and might help resolve issues. Then, re-install steam(sudo pacman -S steam), and sign in again. Download your game and set up proton as I told you. If that still doesn’t work, you’ll want to make a post and share the log files.