I used a “trick” to make YouTube work in my favour. For a few days I purposefully watched and liked/subscribed a bunch of videos about things that I think make me a better me (jazz piano lessons, philosophy conversations, math/physics/CS lectures, etc) until the feed only contains those. If I notice it drifting because sometimes it tries to pull something on you, I make sure I thumb down the new shit and retrain it a little. Has been working well so far!