Why can’t I cancel my icloud subscription?

Downgrade or cancel your iCloud+ plan - Apple Support

"Before you downgrade or cancel your iCloud+ plan, first download or remove content that exceeds your new storage amount. To make sure that you don't lose any information, learn how to copy what you store in iCloud."

Have you downloaded the Apple Support App?? If not, here’s the link!

App Store - Official Apple Support

You should be able to view & manage all of your subscriptions/payments!

Support.Apple.com/guide/iCloud……CLICK HERE FOR WALTHROUGH & INFO to iCloud+ and manage your subscription - Apple Support