They should be demoted to a US territory and assigned one or more military governors until they can prove they can govern themselves, IMO. Course I also think that would need to be coordinated with mass roundups and snatch-and grab operations to make it work.
In other words, California is getting a bit like Catalan, and they may need to be slapped down hard. We’ll see.
first, a purge
followed by martial law and the appointment of a viceroy or territorial governor complete with attendant ministerial cabinet