Use https://soundiiz.com/ to migrate your playlists to other services. I paid a few bucks for one month of subscription and transferred a boatload of playlists (even ones that Spotify generated for me, like my previous Wrapped 'lists) over to YT Music. Source: 6 months ago

For those wondering what I used to convert the playlist, its TuneMyMusic. Theres a better alternative but it has more paid features. Soundiiz. Source: 7 months ago

Although you’ll want to use a service like https://soundiiz.com to transfer your playlist or songs if you added if you want to switch music service too. Source: 7 months ago

Or soundiiz.com can create that I think, but not in order (not sure at 100%). Source: 12 months ago

The good thing is, you'll still have all of your media sorted and organized on whatever hardware was hosting Plex, so you'll just need to install new software to host it. Make sure you're using something like Web Tools or Soundiiz to keep records of any playlists or collections and you'll be fine. Source: 12 months ago

Seeing as how you commented elsewhere that you're prepping for a DJ set, presumably for a genre you don't know too well, you might want to stick the relevant musicians in Ishkur's Guide to Electronic Music into a portal like Music-Map, Gnoosic, or Music Roamer to see what else comes up. Source: about 2 years ago

I took OP's question as a media discovery tool for Lidarr and not so much the request management side of things, but I could be wrong. I'd be interested in the media discovery side of things. I often play around in MusicRoamer, but it's not at all linked to Lidarr. Source: about 2 years ago