How do I solve issues of adding money to my account

Here's an article that has the list of things that you can purchase using you Apple ID balance:

What you can buy with your Apple Gift Card or Apple Account balance - Apple Support (PH)

It appears that purchasing a Gift card with your Apple ID balance is something that cannot be done.

To purchase a Gift card or gift certificate, you may want to use or add another payment menthod for that

Best of luck!