Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
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Microsoft Office 365 Subscriptions can only be purchased in the country/region you currently live in. So, you can continue using your Office 365 apps until the subscription expires. If it's nearing the expiry date, visit the Services & Subscriptions page and cancel your Office 365 subscription there.
https://account.microsoft.com/services
Once the subscription has been canceled and the current billing period has ended, you can purchase a new Microsoft 365 subscription using the same Microsoft account. At that time, you can use a credit card or any other payment method available in the country/region where you are purchasing the subscription. The subscription will then be billed in the currency supported for that country/region.