I use Navidrome with play:Sub (paid) or Amperfy (free as in beer) on iOS. I also use the Volusonic plugin with Volumio to play music throughout the house. All my music is curated using MusicBrainz Picard and the files are mounted read-only for Navidrome.
I looked at Roon briefly, and I know many people like it, but I can’t justify the cost. Plex and I don’t get along; pretty sure it’s operator error and/or grumpiness. Jellyfin looks promising, but I ran into challenges with it as well. I think if you’re just hosting music, then Navidrome is fine. If you think you might expand to series or films, something like Plex or Jellyfin could be better long term.