Other suggestions possible?

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What client(s) and type of setup are you using? If using an Android phone, Symfonium does what you're asking out of the box (Rediscover is a default section on the home page). You can also create smart playlists that have criteria like 0 plays, not played in X days, track or album has certain genres. Smart playlists can also do by album or track, so if you're looking to rediscover entire albums, many at a time, you can set this up pretty easily.

Symfonium functions entirely as a client and can easily use Jellyfin as a source.