I need help empty may App Store Credit

Buy something more expensive and pay the balance with a credit card or contact iTunes Support and ask them to zero balance your account. See the Apple Support articles below for contact information.   

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

If necessary, try Twitter

https://twitter.com/AppleSupport. -  

See this Apple article: Change your Apple ID country or region

Change your Apple ID country or region - Apple Support (KW)9