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>> There should be a way to watch a video once and not have it take over your recommendations.

Log out.

You can't log out of the YouTube Android app anymore. There's only an incognito mode.

Don't use the app

Newpipe

Or if you want the official experience: https://vanced.app

Even if you logout, your anonymous session has its own set of recommendations. No?

Disable cookies

you will get served "interests shared by users from that particular IP", google helpfully assuming its a single household.