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I would not advise starting from scratch, unless you want to lose all your followers and all the progress which has been made so far!  If you possibly can redesign and alter the name / URL of the profile, doing that would be a much better idea. The only exception to this is if, your profile has never previously performed well for you and has seen a lot of bot traffic (which may be perceived as negative by IG). If your profile has anything remotely positive going for it, keep it.