Did you buy your snake already?

If not, I would suggest getting a different snake, like a corn or king, or already established feeder. Ball pythons are notorious for being picky feeders. I think that is the #1 complaint on forums and always mentioned in every bp care sheet published out there. I personally went through that stressful period myself with my bp and it was not fun at all.

If you already bought your snake, I assume it is still a hatching, I fed mine 2-3 hoppers at the start. You can go bigger and start with a small mouse or rat pinkie. Leave your mice in the fridge over night, then dip in the hottest temp water from your sink for 15 min, do it again for another 15 min, then blow dry it 20-30 on both sides, especially its head. Your mouse tummy should feel squishy (Don't pinch it too hard). Using the hemostat, grab the skin near the hind quarters area and present it to your snake. Do the zombie dance if needed. It should strike in a matter of seconds.

If it did not strike, try reheating it and offer again. If still not striking, you can leave it overnight and see what happens. I tried that method and it never worked for me.

I feed only at night, same time every week, and I always make sure his hide is facing away from me so I don't distract him when presenting his food. I also feed in the dark. I don't handle him 24 hours before feeding and 24 hours after. In your case, and I did this as well, for new snakes do not handle it until it eats its first or second meal.

Most importantly is the set up. If the set up is wrong, your snake will not eat. If it is in shed, it may not eat but I had fed mine during shed. If it feels insecure in a highly traffic area, not enough hiding spots or not snuggly enough, etc... It will not eat. Of course, if the mice is not warm enough, it will not eat.

I would recommend trying 1 attempt at f/t, then feed it what it ate before for at least 2 meals then try again.

Also, one huge decision factor you need to consider is access to a vet. If you don't have an exotic vet who has experience with snakes, forget about it.