I’ve carefully curated things to where my feed is actually pretty good and I’ve had little to no problems with it. Then out of nowhere I’m getting all these transphobic recommendations, especially detransitioner content. It was a wild departure from the usual and way beyond the amount of topic specific recs that I’ll get if I look up something specific. It was really gross and I was already having a dysphoria day. Fuck YouTube.
I don’t know how effective it would be because I haven’t played with it myself, but the Blocktube add-on for firefox has an advanced blocking feature that might be able to help you:
https://github.com/amitbl/blocktube/wiki/Advanced-Blocking
Also I give my general endorsement to blocktube, it’s served me well and allowed me to curate my experience without ever logging in to a youtube account. I’ve blocked almost 200 channels, with roughly 60% of them being middle-aged men whining about disney movies that were clearly made for little girls.