The people on this forum are Apple products users like yourself and cannot empty your account balance for you. There are two ways you can try:
#1. If your account’s current country allows you to add a credit or debit card, purchase an item (not a subscription) worth slightly more than your balance. Your balance will be emptied and the excess owed will be billed to your card. This method is the easiest and you get to use all your money instead of just giving it to Apple.
#2. To ask Apple Support to remove and keep the balance:
- Click on the special empty-balance-request chat link at the bottom of this support article ➔ Check your Apple Account balance - Apple Support
- General Apple support and service contact ➔ Contact Apple Support - Apple Support If live support options are available they will show near the bottom left. Telephone numbers may only work when calling from the same country. If numbers show as colored links, click on them for more options.
- With an iPhone, iPad, or Vision, you may be able to chat using the Apple Support App if it is available in your country ➔ https://apps.apple.com/app/apple-support/id1130498044
If you cannot contact Apple then method #1 is the only way to empty your balance. If you can neither add a flexible payment method nor contact Apple, your alternative is to create a new Apple Account when you are in the new country. Avoid doing that if at all possible as it may cause many complications with your current account content and resetting equipment.
When changing account regions there’s a full set of guidelines in this support article ➔
Change your Apple Account country or region - Apple Support