I cannot click done when I choose 5GB.

filmps2 Said:

"I want to downgrade icloud storage but I cannot click done when I choose 5GB."

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Successfully Downgrading iCloud:

A. Go Here: Downgrade or Cancel your iCloud+ plan - Apple Support

B. Important:

Export All of iCloud, Prior to the Downgrade:

Yes. All would be lost, if it is not downloaded to your device itself. So, export all of iCloud. Use my User Tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - Apple Support

If you can't tap Done, make sure that you're signed in with the same Apple ID that you use for your iCloud+ plan. If you still need help, contact Apple Support.