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The trick is to actively tell YouTube what you don’t like, it work quite well for me.

I did try this a few times, but usually it have little effect on my recommendations.

Yeah I do it, and you have to be relentless. Mark every video you don't want to see.

And god help you if you watch even one off-topic video - like another comment mentions, YouTube algorithm then concludes you want to see a million more. Reminds me of a Weird Al lyric about TiVo: "I watched Will and Grace one time, one day. Now TiVo thinks I'm gay."

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