Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello
Do you still have an existing 365 subscription that was signed up in the old country? If so, you cannot just change its currency. Microsoft 365 subscriptions are country/region specific. You need to turn off the auto renewal for this subscription. Let it expire. Then you can update your country and then sign up with a new plan with the new country's locale; it should then apply the new currency.
As long as you use the same Microsoft account, you won't have data loss.