Looks like he's done now. Pretty much all polls hitting at least +8 for Biden, up to +16.
I don't see what Trump can do or say from this position to make things better for him.
Survive covid while his enemies are prematurely dancing on his grave, push the message that covid is basically the flu and that the restrictions are destroying the economy and if he gets re-elected will force people to go back to normal (make state and city level restrictions illegal).