Your Apple account has no interest. It is not a credit account, it cannot generate interest on anything.
If you mean an Apple [Credit] Card, then interest should only apply if you were late on payments.
If you were, then you should have known this was going to happen.
For that amount of interest, it looks like you have been consistently late or not paying enough to cover the minimum amount due and avoid interest rates.
You can't stop paying or being consistently late and expect low or now interest rates.
Every other credit card has interest rates similar or higher than Apple Card if you stop paying them or are consistently late with payments.
click here ➜ How to avoid or lower Apple Card interest charges - Apple Support
If you mean something else, then please clarify what you are referring to.