Deleting the video shouldn't really effect your channel growth that much if you're already monetizing. Just make sure you have access to your YouTube account and follow the steps here: https://yt.be/help/ipPk . Hope it helps!
@TeamYouTube Hello Dear YouTube team, I want to delete the old video of my YouTube channel which has less views, so can I have a problem in a few years or not?
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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