You could purchase something of value greater than or equal to the amount of your store credit or try to get Apple Support to zero out your account balance using this link https://getsupport.apple.com/?caller=cups&PGF=PGF63006&category_id=SC0060&symptom_id=23330It comes eventually from Change your Apple ID country or region https://support.apple.com/en-us/HT201389.
If you are interested in the rules for changing your country or region, see:
Change your Apple ID country or region https://support.apple.com/en-us/HT201389 See 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
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.
And you also can contact iTunes worldwide support via text or chat using this link https://support.apple.com/choose-country-region/itunes. At the bottom of your screen, use Tell us how we can help to select among support options. You should be able to get telephone or chat support.
