Edit: I just tried X11 and it seems a lot more stable. I didn't have time to play a game, but I checked a few things that were causing flickering before and they weren't flickering. On the login screen at the top left, pick x11 from the first drop down and then log in. Hopefully that works for you.

Original message below: If you installed your steam games on a separate partition. Otherwise unfortunately not. You can switch DEs without losing them though. The guy above this said that x11 KDE might fix the issue, and a new version of Plasma might also fix it. Check his comment. Overall though if you want a hands off experience then Pop is going to be a way better introduction to Linux than Arch. Although... Pop uses Gnome. So you would have to change the DE. There are some other distros that are pretty plug and play like Kubuntu or Mint that use KDE. I don't think they're as dialed as Pop, and IDK their Nvidia driver situation though, so check that before deciding.