I was about to clap, but that would be cruel:)

As an experienced author, you probably don't need this advice, and I hope it doesn't make it worse, but for me, its either back off or ramp up.

Back off for some time, let it simmer in the back of your mind till you get that eureka moment.

Or ramp it up, hit it with some more conflicts and tension. Go all out antagonism on that SOB :)

Good luck!