Piefed does know in what communities you posted, which posts you liked, under which posts you commented etc. There could easily be a Piefed (or Lemmy) wrapped. The data is public so you don't even need to be signed into an account to get its relevant data
Jellyfin is quite capable for music, however Navidrome has a much better client ecosystem. Personally I use the Finamp beta on mobile as it does everything I want and is quite stable, but if you want Android auto/apple carplay you will have to use a client that isn’t as reliable or proprietary (paid.
Well if what your reincarnated as dependent on how good of a person you are these odds make sense if you look at humanity as a hole