Cannot activate 2TB iCloud storage

Changing iCloud storage subscriptions.

I have iCloud storage previously shared with my family (200GB). My spouse then signed up on Apple One and shared that with the family including 2TB of iCloud Storage. I have tried to get the 2TB shared to the family so I could cancel the 200GB subscription. Because everyone is using the original shared storage the 2TB is not activated and cannot be shared. Is there an easy way to change over the subscription apart from backing up and cancelling the original subscription?