Tip: if you're curious enough to watch a video of Rossmann's, do that in the incognito mode. Otherwise you'll be pestered with recommendations of the other two thousand of his videos, until the end of your days. Perhaps you'll even be able to follow the epic of his fight by the titles of new videos.
Sorta loath to do that, because I don't want YT to stop suggesting stuff related to that channel and its general topics. I just don't need more Louis Rossmann in my life, the rants don't do me any good—possibly aside from keeping my heart strong from pumping against the pressure, I guess. But the stress snacks will kill me. I'd like the algo to take a gentle hint already, it was like a year since the last watching.
I did some digging in the innards of a Macbook Pro, years earlier, and have a couple leftover screws as a result. I think I'll leave the next endeavor to people with better hands, especially since putting in an extra hard drive isn't an option anymore.
You can remove your history of viewed videos in whole or in part. I've found that the most effective way to stop YouTube's manic obsession for any topic I've viewed once.
There is a Chrome ext that allows you to quickly open a link/video in incognito by clicking it while holding a meta key like shift, highly recommend for avoiding the Youtube recommendation hell [0].
I always watch YouTube in incognito mode, otherwise it pigeonholes you and you don't get to experience all of the breadth of the site. (If you're going to put up with Google you might as well make the most of it.)