i can not downgrade my icloud

Hi there bitadara,

To start, you'll want to make sure you're following the correct steps to attempt to downgrade your iCloud+ plan on your MacBook Air. Follow these steps:

How to downgrade or cancel your iCloud+ plan on your Mac

1. Choose Apple menu  > System Settings. In macOS Monterey or earlier, choose Apple menu  > System Preferences.

2. Click Apple ID.

3. Click iCloud.

4. Click Manage.

5. Click Change Storage Plan.

6. Click Downgrade Options

7. If prompted, enter your Apple ID password, then click Manage.

8. Choose a different plan:

* To downgrade your plan, choose a new storage amount.

* To cancel iCloud+, choose the free 5GB plan or choose None.

9. Click Done. If you can't click Done, make sure that you're signed in with the same Apple ID that you use for your iCloud+ plan. You can also try following these steps on a different device. If you still need help, contact Apple Support.

If you downgrade or cancel your iCloud+ plan, the change takes effect after your current subscription billing period ends.1

You'll find those steps here: Downgrade or cancel your iCloud+ plan - Apple Support

If you're still unable to downgrade your plan, let us know exactly what happens when you try. For example, are you seeing any error messages? Once we have more information, we'll point you in the right direction from there.

Thanks!