I need remove my balance

You will have to contact the Official Apple Support about that, only they have access to your data and settings.

Use the link below as a start:

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• 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.

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copied from: Change your Apple ID country or region - Apple Support

To clear your account balance, you’ll either need to make a purchase of equivalent or greater value than your existing credit.

Alternatively, if your credit is small, you can contact Apple Support and request that your credit balance is removed from your account. If removed, you will lose the credit.

You can contact the Support Team using the Get Support link at top-right of this page. Alternatively, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad, the App can be downloaded from the App Store:

https://apps.apple.com/gb/app/apple-support/id1130498044