Ask HN: How could I optimize YouTube to show more relevant videos?

Sometimes when I want to learn something, I'd open Youtube, do my search query, glance the results and choose 1-2 videos to watch. However, when I've learnt the stuff, I necessarily don't want to see more videos related to that subject. For example, I saw a video explaining how car clutch works. After watching that, it's not like I want to see 20 more videos about car clutches explained by 20 different people. Yet, those videos seem to pop up in the recommended section.

Things I've tried: 1) Use incognito mode for the subjects that I'm interested only once 2) Enhance the recommended section by removing the non-interesting channels from the list 3) Remove non-interesting videos from the search and watch history 4) Do queries to fake interests

Unfortunately, none of these seem to work. Almost everytime I open Youtube, I cannot find the videos I'd be interested in. I'm not sure want I want to see but most of the time it's hardly anything that is offered.