Apple account balance

I understand that you may want to change the country and for that, your credit balance must stand at Zero.

The options available to you are...

1. Add more funds and buy something useful else
2. Learn what to do if your remaining store credit is less than the cost of a single item.

But I don’t have any balance in my account and keep showing can’t change.

Check again for sure, see -> Check your Apple Account balance

Check your Apple Account balance – Apple Support (UK)

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If you have an Apple Account balance that you can’t use

You can't redeem or return Apple Gift Cards, App Store & iTunes Gift Cards or unused Apple ID balance for cash, except as required by law. If your jurisdiction allows the refund of redeemed gift balances, you can contact Apple Support to request a refund. 

When you contact Apple, include the following information:

•               Your Apple ID.

•               The refund amount.

•               Your current delivery address.