Because I consider myself not to have enough time to truly explore music, I'm disappointed that Spotify (same data as this) does not make it easier to discover

Because I consider myself not to have enough time to truly explore music, I'm disappointed that Spotify (same data as this) does not make it easier to discover music that's similar to my music, but different. No matter how I use its "radio" feature it's very rare that I find a truly unique branch to explore that doesn't just lead back to the same artists, or at least to the same sub-genre. Unfortunately I don't see the common theme in music I like represented in the two dimensions chosen for this representation, so it doesn't help terribly much. Given I like (per this data) "Celtic" and "neo-mellow", it turns out "japanese guitar" and "pop rock" aren't actually the correct next steps for me...