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Greetings elham1359,

Thanks for visiting the Apple Support Communities! I understand you'd like to downgrade your iCloud storage plan.

The following article shows helpful steps for downgrading your iCloud storage plan: Downgrade your iCloud storage - Apple Support

"On your iPhone, iPad, or iPod touch

1. Go to Settings > [your name] > iCloud > Manage Storage or iCloud Storage.
2. Tap Change Storage Plan.
3. Tap Downgrade Options and enter your Apple ID password.
4. Choose a different plan.
5. Tap Done."

Kind regards.