There are a few different things you can do. If he doesn't take the live mouse, keep the mouse and kill it and expose the brain. Then take tongs and have it do somewhat of a dance. Sometimes it helps if you put the ball python in a box for a while where it's nice and dark, then open the box and give it the prey.
Before feeding live please stun the rodent first to ensure the safety of your ball python. Use something like tweezers or tongs to pull the head of the rodent away if it seems like it's going to start biting your ball python. We wouldn't want him to get hurt!
Sometimes gerbils can strike interest in your snake because it is more closely related to what they eat in the wild. If you do not want to feed a gerbil, you can ask a pet store if you can use some soiled gerbil bedding to rub another rodent or prey item in.
Some ball pythons have a preference between mice and rats, perhaps baby rats might make your snake eat. However, those are hard to get live unless you're the one who breeds them. This is all I can really think of doing, you can combine methods or take away some things. It really depends on your ball python, because they're really picky sometimes.
Good Luck.![]()