Jellyfin is great but has some issues that can make it annoying. The 3rd party clients are often better than the normal interface. The server is easy to set up. So I can recommend all of it.

Honestly though, just because it isn’t updated doesn’t mean it is not great. I always revert to Clementine myself. Still use it daily and love it. There is an updated variant called strawberry which is updated and works great, but the remote doesn’t work.

I really like Aves Libre.

You can simply install Steam. There are many Linux native games and steam has a compatibility layer that makes it easy peasy to play almost anything. Wine isn’t necessary.