I've been working on converting my gaming PC to Linux for a few weeks, but everything is running, but it all is just a little jankier than I would like.
I have an 8th gen Intel i7 and an Rtx 2070, running Arch linux.
Sometimes I boot up and my mouse doesn't work and I have to restart. Sometimes I launch games and they just don't launch right.
It feels like I'm doing a lot of work for no benefit. In fact, Elden ring runs way worse on my Linux partition than my Windows partition.
I've tried GE proton, gamemode, steam compatibility, everything... I'm sorry but I'm going to have to stick with Windows for gaming.
with the issues you've had i think it's perfectly understandable, but I'll agree with other commenters that arch is not a good choice for a first distro. i recommend trying dual booting windows and a more "beginner " distro like Linux mint or pop_os
the reason why arch gets recommend a lot as a gaming distro is that it is bleeding edge. Their for has very up to date drivers and parches that can help gaming. But with the current state of gaming on Linux this is a bit less of a requirement. most distros are new enough for most games. Exception might be debian LTS or something.
So i totaly agree that choosing something other then arch for gaming is a good option if you are rather new to linux.
As a longtime Debian Stable user, I can attest that gaming on it works just fine, whether via Proton or natively.
It was rough at the first half year or so after Steam Linux client launched where system libraries were simply too old and one had to smuggle in libc from Ubuntu, but that got solved by the next Debian release, and it's been smooth sailing ever since. :)
Of course, I wouldn't recommend Debian for a gaming system for a newbie. It's just what I've been using as my daily driver for decades, so I did not want to switch to something else just for something as unimportant as gaming.
Bleeding edge should still work though. KDE Plasma does not seem ready for Nvidia. They should have a big-ass banner on the wiki that says "this DE will be janky as fuck if you have an Nvidia card".
I'm saying that it doesn't work. At least not without some pretty serious bugs. Perhaps there are some magic fixes out there that I haven't found, or perhaps I have some taboo combination of hardware, but so far I haven't been able to fix the visual and latency bugs that are present with KDE Plasma and an Nvidia GFX card. I've followed the wiki thoroughly, and some instructions on some forum threads, but none of it helped.