Change region

1. Open the Settings app. 
2. Tap your name, then tap Media & Purchases.
3. Tap View Account. You may be asked to sign in.
4. Tap Country/Region
5. Tap Change Country or Region.
6. Tap your new country or region, then review the terms and conditions.
7. Tap Agree in the top right-hand corner, then tap Agree again to confirm.
8. Select a payment method and enter your new payment information and billing address, then tap Next. You must enter a valid payment method for your new country or region.* Find out more about how to change or remove your payment information. 

Also you can refer to this apple blog Change your Apple ID country or region – Apple Support (UK)

You need a zero account balance and you need to cancel all your subscriptions. If you have cancelled all subscriptions, but some haven’t expired, contact iTunes Support. You need a valid credit card issued by a bank in the country the store is in and you need a billing address in that country. If you have an account balance, either buy something more expensive and pay the balance with a credit card or contact iTunes Support and ask them to zero balance your account.

Purchases - View, change, or cancel your subscriptions.      *

How to cancel Apple TV+.  *

Purchases - Subscriptions not billed through Apple    *

Link to contact Apple Support at the end of the article.

Purchases - the subscription that you want to cancel is not listed    *

Region - Change your iTunes Store, iBooks Store, or App Store country or region.     *

If you have done all the above and are still having problems, contact iTunes Support. See the Apple Support articles below for contact information.   

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

Apple on Twitter  - 

Messages chat with Apple

Hello ~Take a look here…

Change your Apple ID country or region - Apple Support

~Katana-San~

Complete guide here:

Click ▶︎ Change your Apple ID country or region. 🌐