After finishing C2077 I immediately replay TW3 actually.
They improved in some aspects, made some trade offs with the quest system(TW3 has a mesh of quest way more interconnected than C2077), some things are worse in C2077(voice over in TW3 was better in general, maybe was COVID). But in the end of the day I like C2077 more, I probably will never play TW3 again.
For mods, try Limo or you can use ProtonUp-Qt to install Steamtinkerlaunch, with steamtinkerlaunch is pretty easy to use Vortex. Cyberpunk has a modding wiki with a tutorial to setup mods in linux, is just the setup process and not how to install mods.