Need to change my payment method

There was an annual plan, but it was discontinued. One option is to buy App Store/iTunes Gift cards and redeem them to your account. The monthly charge should be withdrawn from the account balance before your credit card is charged.

App Store & iTunes Gift Cards by Email

Gift cards redeem

Gift Card - can’t redeem

That depends on what you are paying for. For example, extra iCloud storage is a monthly plan. There isn't an annual plan.

You are welcome.