You can personalize the recommendations by clicking on the 3-dot menu and selecting "Not interested" and/or "Don't recommend channel". It even asks "Tell us why". I'm Indian and I hardly see any Indian videos. Here are my recommendations right now:
(Basically Anjunadeep, Patrice O' Neal, and Batman :-) ).
I believe their recommendation ML is top-notch and they keep improving it. For example, it seems to have finally learned that I absolutely effing hate "reaction" videos (it used to struggle with that ~ 1 year ago).