Biden should resign the Presidency now and allow Kamala Harris to be sworn in. Then he should release his delegates to the Democratic National Convention. If Biden can’t campaign effectively, then he can’t govern effectively either...This situation is why we elected Kamala Harris to be Vice President. To step in if Joe Biden is unable to serve. Kamala should serve the remaining four months of Biden’s term while running for re-election as the incumbent President.
If Biden resigns as President now, Democrats will unite behind Kamala Harris at the August convention. Sure, there are plenty of ambitious egos out there, but you can bet they’ll all fall in line rather than challenge an incumbent President Harris for the nomination.