This is important, if your games are installed in a drive formatted in NTFS you will have problems with Proton/Wine/etc. One way to discover the issue is to run Steam from terminal and it will tell you the details in an error message
If you don't want this to happen in the future there is a solution that still works in the steps 4 and 5 of the first section of this tutorial:
shaka
joined 1 year ago
But are your games installed in the Ext4 partition? See my other reply from before.