Wtf do you want him to do? He loses the election in this hypothetical scenario. Do you want him to stage a coup? Refuse to leave office? How would that make him any better than dump?
His best is literally all he can do. If you feel that isnt good enough, that's a completely separate discussion.
Well we want him to step down now so someone else with a better chance of winning can run instead. I think this attitude of well if I lost and all the bad stuff happens it's alright cause I tried my hardest is just infuriating cause it would be literally his fault for not stepping aside and he's not even willing to accept blame for that.
His best would be to promote a far more electable candidate and step down immediately. Continuing to stumble to the finish line and ultimately lose because of it is foolish.