You need to clean your watch history. Remove any video you dont want affecting the recommendations and if you accidentally watch some video like that then you need to remove it from history. If you dont have history on then I have no clue how it recommends stuff though. I dont think it bases it on every single thing on the history or maybe it weights recent videos more heavily.

I recently had it recommend way too much certain kinds of videos after i watched a bunch of them and it reverted to what it recommended earlier when i removed most of the ones i watched earlier.

maybe they just consider those people successfully suppressed