How do I reset my App Store balance to zero for country change?

Buy something more expensive than your balance and use a different payment method from the current region for the extra amount; if you can't, click here and ask the iTunes Store staff to zero it.

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This is a user to user only forum, NOT Apple Support. We can't do anything to empty your wallet balance in order to change your country. You also posted your Apple Account email on a public forum, visited by people from all around the world. NEVER post personal information in a public forum. I have asked the forum hosts to remove your email address for your safety.

You will need to contact Apple Support directly, who can empty your balance on your account so you can change countries. Open this link and read the last section, which explains how to contact Apple Support if you need to use your funds --> Change your Apple Account country or region – Apple Support (UK)