I cannot downgrade my Apple I Cloud Storage to Free

Welcome to Apple Support Community!

If you want to downgrade your iCloud + plan, follow these steps below.

1. Settings
2. Name
3. iCloud
4. Manage Storage
5. Change Storage Plan
6. Select Downgrade Options
7. Select None or the Free 5 GB

Please note that when you change your storage plan, it does not take affect immediately.

Your new storage plan will start at the end of the currently subscription billing cycle.

Downgrade or cancel your iCloud + : https://support.apple.com/en-us/HT207594

Hope this helps ;)

You’re Welcome!