How to delete iCloud storage.
How to delete iCloud storage?
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If you mean that you want to cancel your upgraded iCloud storage plan:
Cancel upgraded iCloud storage by downgrading to the free 5GB plan. See instructions in the following Apple article: Downgrade or cancel your iCloud+ plan - Apple Support
If you mean that you want to remove some data from iCloud storage:
See: Manage your iCloud storage - Apple Support