Hot take (not entirely serious):

Now that Presidents can’t be prosecuted for official acts that are crimes, Biden should enact Project 2025 EARLY give himself unitary executive power, and refuse to leave office.

This would either destroy the country, save the country, or force SCOTUS to reconsider their ruling.

Of course he could just deem the imbalance on SCOTUS a threat to national security, and write an official law saying that all major parties must be equally repressented by the judges on there (a one out, one in law).

That would also work, and run less risk of tearing the country apart.