Hey there, just follow these steps to remove your custom URL: https://yt.be/help/4moa . You can even claim a new URL right after (If eligible), but it takes a few days for the old one to stop directing to your channel. Take note, you can remove a custom URL up to 3 times per year.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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I decant personal thoughts here.