I used to worry about this a lot when I 1st started. Until you get a feel for just how picky Ball Pythons are, it's easy to worry and get frustrated when your new investment isn't eating. My first snake to go on an 8 month fast scared me, but she eventually started eating again on her own time and barely lost any weight.

I used to try and switch prey items, size, colors of food, temperatures etc. Nothing seemed to help more than anything else.

Assuming all of your husbandry is spot on, which you should triple check first... The best results I've had are physically moving the snake into another section of your rack/room. Or completely changing them to a different type of substrate. Nothing else has seemed to stand out with my collection.

Good luck!