First step is a vet check with a fecal exam--some internal parasites can cause a loss of appetite, and snakes with them may be 'picky' or stop eating. Pinworm is a common culprit. Always rule that out when you have a snake that is behaving uncharacteristically. A male would be expected to be eating at this time of year--it's not the typical breeding season.

The crumpled newspaper trick has worked for me with starting very stubborn hatchlings.

Offer live, and a smaller than usual prey item (but not ridiculously small).