I can't remove my card from Apple ID payment methods

Try adding a new payment method, then promote the new payment method to be the primary payment method. You should then be able to remove the payment method you now have on file.

See if the Apple Support article(s) below helps answer your question.

Apple ID payment information - change.  *

If you need to change or update your Apple ID payment method.  *

Hello ~ You have an active subscription and therefore you cannot remove your payment method. Take a look here by clicking on the following link…

Remove a payment method from your Apple ID - Apple Support*

*If you can't remove a payment method

If you have subscriptions like iCloud+, have an unpaid balance, or you use purchase sharing, you must keep at least one payment method on file.

• Do you have a subscription? You can cancel iCloud+ and cancel other subscriptions from Apple. When your subscription period is over, remove your payment method.
• If you're in a Family Sharing group and you use purchase sharing, the family organizer must have a payment method on file. If you're the family organizer, turn off purchase sharing, then remove the payment method.
• If you have an unpaid balance, you might not be able to remove a payment method. Instead, change your payment method.
• If you still can't remove a payment method, contact Apple Support.

~Katana-San~