I buyed a Gift card in Mexico but I have US system,How do I fix it?
How to change your Country on iPhone so I can redeem a gift card from a mother country?
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You cannot change Apple ID countries unless you have a payment method for the country you wish to change to.
If you are not moving to Mexico, then changing the region is not an option since you will be forced to cancel all active subscriptions and may lose access to certain purchases that may not be available in the Mexican store.
The region change is not something to be taken lightly. See here: link-> Change your Apple ID country or region - Apple Support