Lots of Jellyfin love in here, love too see it. The sever end of is great, the client end though... not so much. If you are just looking for a plug and go, plex has the maturity of their clients with a very workable backend. just about every device out there as an up to date official plex app, right down to a windows app if you really want it.
Again, no shit on Jellyfin here, Plex is a business after all.
Gotta give it to you, you plugged away, learned, plugged away some more and got a really nice starting base for a setup. Now it's time to start burning time and money on ever increasing space, a docker stack, a more powerful server (leaving the pihole to handle the ads), and on and on lol. Welcome to the hobby!