Count me as another person who has gotten increasingly frustrated with the terminally stupid youtube recommendations. I don't have a good fix for it, but I did stumble on a workaround/kludge while desperately searching firefox add-ons for such: install the Channel Blocker extension and you can at least permanently stop getting served the same recommendations over and over again no matter how many times you go through the tedious process of clicking on the 3 vertical dots, clicking on "not interested" then clicking on "tell us why" and then clicking a 4th time to check the box for "not interested in this channel."
Another, somewhat more malicious but just as tedious method that works on a per video basis, if not per channel, is to report a video as spam (or violent or whatever). I try to reserve that for the clickbaity crap like, "Blah blah did blah, and then THIS happened..."
Oh, and is it just a US thing, or do people in other countries also repeatedly get recommendations that are in a language different from what you specified in your google account settings? I don't know why Google/YT thinks I can understand Russia or Polish, but it seems pretty convinced of it.