He should call it quits together with all other pollsters. All that predicting is at best a totally useless activity or even worse, it influences voter behavior. Bet on football games instead. At least that doesn't do damage to the country.
The main point of polls is to influence and give social proof to selected candidate.
Don't believe me? When you look how they are constructed it becomes clear. Too bad for Clinton campaign she was highly unlikable and even the most expensive campaign in history couldn't help her.