Symphonium supports playlists. You can make a own manual playlist or a “smart” playlist, which has the x amount of least listened to songs, the 10 highest rated ones and so on. Everything is on the listening device local, so you have to backup for yourself. Symphonium is really really customizable.

Screenshot_20250829_135759 Sorry for german. A setting for an intelligent playlist for all highly rated songs which I havent listented to in 70 days. (AND/OR) can be set for rules. Its amazing.

Music recommendation is not really a thing unfortunately by the nature which most of download->server->jellyfin->client systems run. I sometimes use listenbrainz (by the musicbrainz team) like lastfm