You can disable your watch history and then you only get related videos to the current video as far as I can tell. It does remove all of the videos from the home page, but I've been using youtube like this for 6 years and I don't mind it one bit. I have an alternate account with watch history enabled and I look at the home page every once in a while (obviously my history is very stale), it doesn't seem like anything of value was lost and I definitely never have to see a Mr. Beast thumbnail on my normal account.
How to add channels under the same email address: Click on your profile picture > switch account > view all channels > create a channel.
A highly beneficial side effect is that it disables the main YouTube shorts stream. You still get some shorts for your subs and such, but the bottomless heroin feed if Shorts is gone, and good riddance.