Last time I checked timeshift did not work properly with btrfs. You can create backups, but restoring them fails.

Are you using wayland? No idea if there is cinnamon wayland. I have the same issue on gnome, the last nvidia driver that worked under wayland was 570. Since then, unfortunately the only thing that helped was going back to X.

I recommend void. It’s rock solid, “stable rolling release”, no systemd, amazing package manager. The installation is a bit more “advanced”, but I guess coming from Arch that should not be a problem for you.