You have good instructions here: https://support.google.com/googleplay/answer/7431675?hl=en . But since this is Google you need to add payment method.
Change your Google Play country If you move to a new country you may want to change your Google Play country. Your Google Play country determines what content you see in the store. The apps, games, and other content in the Store can vary by country.
You can only change your Play country once per year. So if you change your country, you wonxe2x80x99t be able to change it back for 1 year. When you change your country, you wonxe2x80x99t be able to use your Google Play balance that you have in your old country in your new country. Change your Google Play country To change your country, you need to set up a new country in Google Play. To set up a new country, you must be in that country and have a payment method from the new country.
On your Android phone or tablet, open the Google Play Store Google Play. Tap Menu Menu and then Account and then Country and profiles. Tap the country where you want to add an account. Follow the onscreen instructions to add a payment method to that country. The first payment method must be from the country youxe2x80x99re adding a profile for. Once you create the profile you can add payment methods from other countries. This creates a new Google Payments profile linked to the new country. The Google Play Store will automatically change to the new country. It can take up to 24 hours to change.
If that is not working: Fix problems changing your Google Play country If you can't change your Google Play country or don't see the option to, try the following:
Clear your cache and data On your phone or tablet, open the Settings app Settings app. Tap Apps & notifications and then See all apps. Scroll down and tap Google Play Store Google Play. Tap Storage and then Clear cache. Tap Clear storage and then OK. Check if your app is updated Open the Google Play Store app Google Play. Tap Menu Menu and then My apps & games. Games with an update available are labeled "Update." You can also search for a specific game. Tap Update.