The YT recommendation system is basically "we know what you want to watch better than you do", so it keeps blatantly ignoring any opposite signal.
No, I do not want to watch wedding videos that I've said I'm not interested in at least 50 times. No, there isn't anyone in my household watching wedding videos.
No, I do not want to rewatch a 6 hour long lecture I watched last month.
Yet it just doesn't bloody care. I am truly terrified to click on anything outside my regular comfort zone for fear that that's what I'll be recommended for the next 12 months. Youtube is the worst product I have to keep paying for — I tried going adblock, but good luck if you have Apple devices. I'd rather be held hostage to Youtube Premium than being brainwashed with ads every 5 minutes.