In order to change your country you will need to follow some steps, the steps are listed down below
If you have balance in your account, either spend it, or if it is less then the cost of a single item, ask iTunes Store support staff to zero out your balance for you iTunes - Official Apple Support
After that, follow these steps in order to change your country:
- Open the Settings app.
- Tap your name, then tap Media & Purchases.
- Tap View Account. You might be asked to sign in.
- Tap Country/Region.
- Tap Change Country or Region.
- Tap your new country or region, then review the Terms & Conditions.
- Tap Agree in the upper-right corner, then tap Agree again to confirm.
- 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.*