Welcome to BP.net!
First, please don't try assist feeding. For a BP as old as yours, it almost always causes more harm than good. It's very stressful on the snake and is an almost sure fire way to keep a hunger strike going or trigger a regurge.
We’ll need a lot more info before we can start trying to give you any useful advise.
What kind of set up do you have your BP housed in?
Tank or tub?
How big is the enclosure?
How many hides?
Where are the hides located?
How are you heating your enclosure and how are you regulating and measuring the temps?
What are you using for substrate?
How often do you clean the enclosure?
A picture of your set up would be worth a thousand words.
About your snake.
Male or female?
How much does it weigh?
Please keep in mind that a hiding ball python is a happy ball python. Spending most of its time inside a hide is normal and preferred.
About your feeding.
Are you feeding mice or rats?
Live or F/T
How big are the prey items?