On the top of the home page they have a category control that lets you look for different genres of stuff from your algorithm plus a "new to you" category. I think that's supposed to be what you're after. I hardly ever use it because I forget it's there or don't need it to steer the algorithm my way.
I agree with the minor caveat that I'd like a "broaden" button and a "change theme" menu.
My search algorithm presents me with content that I find quite enjoyable, but I'd like to be exposed to a little more stuff that's outside of my bubble.
It knows what I like based on what I've watched, but it doesn't know me and therefore can't infer stuff I don't know but would enjoy if I was exposed to it.