Changing country/region
Although I have cancelled subscriptions but they still appear active until end of subscription period. I can't change/add a new payment method either
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Change your Apple ID country or region - Apple Support
"Cancel your subscriptions and wait until the end of the subscription period. "
Contact Apple Support
If you can't complete any of the steps, can't change your country or region, or you have less store credit than the cost of a single item, contact Apple Support.
Good luck!