How to remove my store credit

If you want to clear your Apple ID balance, it is depending on the amount:

1.

If your balance is less than the cost of a single item, contact Apple Support directly, they will help you clear your balance, click -> Get Support

Fill in the field >Tell us what's going on<

2.                                                                                                      

See -> Check your Apple ID balance

Check your Apple ID balance – Apple Support (UK)

scroll to ⤵️

If you have Apple ID balance 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.

If you then want to change Country or Region, you must comply with all regulations described here -> Change your Apple ID country or region -> Change your Apple ID country or region - Apple Support (KW)

Hello sergei,

I see you have remaining balance that you wish to remove from your Apple Account. Let me help you with that.

Read this support article for information about requirements for changing your Apple ID country or region --> Change your Apple ID country or region - Apple Support . I quote various sections Apple itself says in this article, and from Check your Apple Account balance - Apple Support referred to in the article, about removing account balance:

+ "Spend any balance remaining on your Apple ID"

If you find your store credit is less than the cost of a single item and you still have a valid payment method such as a credit card for your old country, you can use the payment method to make up the difference in the cost of an item ( How apps, content, and subscriptions from Apple are billed - Apple Support ). Perhaps buy something such as a music track which you can download and also keep a backup copy. Remember that anything purchased may not be available for re-download in another country but as long as you have your own copy you will always have it.

+ "If you still can't change your country or region, or you have less store credit than the cost of a single item, contact Apple Support" using this link --> Apple Support

Apple removes your balance and keeps it.

+ "Check your Apple Account balance" refers you to Check your Apple Account balance - Apple Support

Note the sections "If you have an Apple Account balance that you can't use", and "If you plan to delete your Apple ID or change your country or region"