Hi Stargirlnuvi
Welcome to the Apple (user-to-user) Community
Here's Apple Support's method of removing a card:
How to delete an Apple ID payment method:
Remove a payment method from your Apple ID - Apple Support
Else:
Maybe you still have iCloud or ?
Apple Support's article:
If you can't remove a payment method from your Apple ID – Apple Support
says:
Eg: "If you have subscriptions such as iCloud+,
have an unpaid balance
or use purchase sharing,
you must keep at least one payment method on file".
and
"If you still can't remove a payment method, contact Apple Support."
All the best :-)