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Most of the time I open youtube in Google container tab, see any interesting video to watch, but I often don't want to have related videos recommended to me. So I watch them in temporary containers.
Because the recommendation is like this, just because I like 3kliksphilip talk about niche ladder mechanic in counter-strike, doesn't mean I'm interested to some random e-sport CS player talk about CS tournaments.
Or one time I watch 2kliksphilip's video on DiRT Rally, I get videos from racing youtubers talk about their driving wheels, and even real-life Rally videos. (Philip doesn't even use driving wheels, he used keyboard, but this is unrelated :3)
Unsure what platform you're using, but on desktop there are options to tell it you're not interested in a video or even a whole channel.
And once I've done that a few times, I get recommendations that are clearly the algorithm struggling to figure me out. What also makes me suspect it has no idea is the appearance of the "watch it again" section. "Ah-ha! We know you watched these videos, so you're bound to want to watch them again!" and then I say I'm not interested in those either.
When the AI revolution comes, that one particularly confused robot is gonna come find me, I can tell.
From my personal anecdotal experience those buttons are not very effective.
Desktop, I only use NewPipe on phone. The idea is to prevent those videos listed in my watch history. But I do use the “I'm not interested” button sometimes to further fine tune the recommendation.