My strategy is to use YouTube and SoundCloud's recommendation engines solely to find artists - not listen. If I like the few samples I hear, I copy-paste their URL into ytdl-sub with their respective genre (https://github.com/jmbannon/ytdl-sub).

This will download their entire discography on a cron job and properly tag them. Then use your favorite self hosted music app to put that genre on shuffle (I use MusicBee). Smart-playlists and proper tagging go a long way for making 'discovery' playlists. If it's an artist I really like, I will 'upgrade' them to a better quality via soulseek or torrents.

While it's not fully automated, I've found this workflow to work better than anything else. I am biased because I am the author ☺️

I was in search of something similar. I have a discography on my servers and was looking for a self hosted solution to generate playlists according to some mood tweeking. Like a cron job at midnight creating 10 playlists from all my discography with some basic filtering: classical, metal, calm, high beat, etc...

So far I found nothing.

Someone let me know if something's out there. Pretty happy with Plex but I miss the music recommendations

Beatbump.io

But it's buggy.

Not exactly new music, but Plex with Plexamp and it’s sonic adventure feature really changed my musical life rediscovering stuff I have on disk since decades now.