The thing I miss and can't find a replacement for is lastfm inside of Spotify. It gave two things and did it exceptionally well:

1. Helped me take something I like or am super into at the time (band or song) and give me a playlist

2. actually suggested with a high hit rate something I didn't know about and it was available to play right now.

other streaming or stations just loop into what I already have which sucks. Side note that I'm into pretty niche non mainstream music such as Melodic Death Metal and Industrial so self hosting seems interesting but I also spend a good chunk of my time looking for more music. (Most of the bands I am really into only have sub-20k plays a month on Spotify).

I really miss Napster letting you browse people's music when you found someone who was also into things you liked - pure gold mine only second to a LAN party where you could dig through the file server.

> I really miss Napster letting you browse people's music when you found someone who was also into things you liked - pure gold mine only second to a LAN party where you could dig through the file server.

If you are a bandcamp user, find people with similar purchases to you and follow them. It is a good way to browse for new albums based on people with similar tastes.

I tend not to overload my personal library with stuff I'd never listen to.

However navidrome at least supports lastfm via external Integration: https://www.navidrome.org/docs/usage/external-integrations/

I never used it so I can't tell if this is what you're looking for or at least the right direction.

Soulseek provides a similar experience! You browse users' files and find folks with great collections of cool stuff.