Downgrading icloud storage plan
Am not able to click done to downgrade my icloud storage plan. Have tried to login into apple ID on multiple devices and am still not able to downgrade back the free storage plan.
This is primarily a user-to-user support forum; other Apple users like you. See the following from Downgrade or cancel your iCloud+ plan - Apple Support
If you can't click Done, make sure you are signed in with the same Apple ID as your iCloud storage plan. You can also try following these steps on a different device. If you still need help, contact Apple Support.