I use multi-account containers to separate my YouTube accounts. That way I (mostly) only get recommendations in the side panel on YouTube for the types of videos I want to watch for that account. For example, I have a tennis YouTube account where I only get recommendations for tennis related stuff (because I only subscribe to tennis related channels on that account). And I have another just for watching philosophy related videos. And yet another for studying Japanese where I only get recommended Japanese language content. And then there's my watch tech account, and my birding account, etc. etc.