Unfortunately I think casting away Kamala as the pick would do more harm than good. She is the likely candidate. Joe can even make the transition smooth by entrusting the rest of his legacy with her, which is the reason he chose her as a VP in the first place.
People also know the name Kamala Harris, and they’ve known it for years now. It’ll be a huge turn to bring in a new candidate on top and do all of the rallying needed to get votes.
I think Kamala’s success will spend on the VP choice, her administration, and her campaign team more than her herself.