Thanks for clarifying. Have you tried selecting "Not interested" on the video? You may also want to try removing related searches or the video itself from your history, here's how: https://yt.be/help/cJiM
Just to clarify, did you try to block users using the process shown here: https://yt.be/help/bhZv ? If so, they will only be blocked from sharing & commenting on your contents. If this is about something else, let us know.
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