For gaming - https://github.com/sonic2kk/steamtinkerlaunch1 It bundles a few useful things as well like another suggestion: https://github.com/FeralInteractive/gamemode as well as quite a few others, tinker is especially useful if you want to mod too, making mod organizer 2 very easy to use, taking a lot out of the otherwise manual set up
Also in general, look for custom launchers, Genshin has a custom launcher, runescape as well, I believe gog does too. If you can’t use foss at least use a better launcher.
for media honestly you can’t beat VLC, but I run a plex server I typically use, for music I use strawberry, and for asmr desktop noise Blanket is a super cool package, and I like Cozy for audio-books.
Edit: Oh and for gaming I saw another comment recommending retroarch and I totally agree, retroarch works amazing on linux, so much better performance than I ever had emulating on windows before I switched.
:) Yep you can! There’s “An Anime Game launcher” for linux