Debit card change

Hello ~ Since you have subscriptions you will have to add new method of payment first and the remove old one.

Change, add, or remove Apple ID payment methods*

*Remove a payment method — Tap Edit, tap the red Delete button, then tap Remove. If you have an unpaid balance, have subscriptions including an iCloud storage plan, or you use purchase sharing, you can't remove all payment methods. Learn how to remove all payment methods.

~Katana-San~

See if the following support article can help: If you can't remove a payment method from your Apple ID - Apple Support

If it does not, you will need to contact Apple Support directly for further assistance with this matter. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.