Nice. Just want to point out that there is jellyseerr for jellyfin as an alternative to overseerr.
There is also reiverr which is new which allows managing sonarr,radarr, and jellyfin (basically it providers an interface to watch jellyfin content and also add episodes and movies to sonarr/radarr. I use reiverr for me as admin but it doesnt do requests as of now so i keep jellyseerr for my users
There is also watchtower on docker that automatically updates your images
And finally there is rdt-client (real-debrid torrent client) which is a real debrid client that pretends to be qbittorrent and allows sonarr/radarr to download from real debrid instead of torrenting it
They are both media servers. Plex is closed source and requires you to make an account with them to use whereas jellyfin is open source and requires no account.
Basically when you set them up you just pick a directory for movies and tv shows and any video files in that directory can be streamed thru the app or web ui
I prefer jellyfin because of the differences i mentioned earlier but i use both (you can point them at the same directories). I haven't really had any issues with jellyfin performance but run plex as a backup.
Plex has plex shares too where you can stream other peoples content from your server. Idk if jellyfin has that feature