Assume that Trump loses the election by a decisive margin. What does he do between early November and Inauguration Day?
It won’t be pretty. He will be sulking at Mar-a-Lago and tweeting furiously. His interest in governing, always limited at best, will be restricted to finding ways to reward his friends and punish his enemies. He will pardon people who suck up to him and consider pardoning himself. He may direct people around him to destroy records that would make him look bad. His cooperation in making the transition should not be assumed.
The best case scenario is that he plays golf and watches lots of TV. Sad!