Yep, I have an OG lifetime Plex pass but moved over and shifted a bunch of users, but now run both in tandem with watchstate sync in case Plex becomes extinct. Navidrome as a standalone is better than using jellyfin for music.

Running both with watchstate is a smart hedge, I hadn't heard of it. I actually only use Jellyfin for music, no video at all, with Manet on iOS as the client: it's built just for music and works great. Still, Navidrome sounds worth a try. Which mobile client do you use with it?