I am unable to change my country on App Store

In addition to canceling your subscriptions, you must also wait until the end of the subscription period.

⇢ If you want to cancel a subscription from Apple - Apple Support

Also learn how to ⇢ Change your Apple Account country or region - Apple Support for step-by-step guidance 🌐

Wait until it expires, or click here and use the link to contact Apple Support.

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昊朋 wrote:

u mean i need to waitting for the expire of apple music and then i can change my country and do we have any thing else method？

As stated, you can also contact Apple Support. Have a great day.