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Here are the rules for changing your country. Use the support link in the third section below.

Change your Apple ID country or region https://support.apple.com/en-us/HT201389See this heading especially What to do before you change your country or region

Use this link in the document if you need to View your Apple ID balance https://support.apple.com/en-us/HT202359

Here are the rules for changing a country. 

If you can't complete any of the steps, can't change your country or region, or you have less store credit than the cost of a single item, contact Apple Support. Note that you could just purchase something of value greater than or equal to the amount of your store credit or ask iTunes Support to zero out your account balance using this  iTunes Support Form https://support.apple.com/en-euro/itunes-contact