For me music discovery is a solved problem. Here's the algorithm:

1) Imagine the timeline of musical history. If you don't have a clear idea of it, Wikipedia is a good place to start.

2) Pick any genre/period you don't know well. (For example, medieval music, or swing-era jazz.)

3) Look up the main figures of that genre/period. (For example, Guillaume de Machaut, or Duke Ellington.) Wikipedia is good for this too.

4) Listen to a sample of their most well known pieces. YouTube is good for this.

5) Repeat. Go down rabbit holes when you like.

No fancy tools needed, just your mind and the internet. This will give you interesting music for many years, and improve your musical taste a lot too.