Why can't I change the region in the App Store?

First, cancel your subscriptions and wait until the end of the subscription period.

Second, make a request to zero out any remaining balance on your account by contacting Customer Support by phone or chat:

• Chat now or call 1-800-APLCARE.
• International Support.

—Then—

Click ▶︎ Change Region. 🌐

You tell us.

What happens when you try exactly?

Do you get an error? If so what does it say?

See the following support document for details.

click here ➜ Moved to a new country or region? - Apple Support