country in the App Store

Click on the link and read how to "Change your Apple ID country or region" - https://support.apple.com/HT201389

It lists several things that have to be done before changing country.

If you still have problems Click here --> https://support.apple.com/choose-country-region/media-services Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232

I am not fully understanding your problem. You have an old subscription that needs payment and you need to change country to do that but?

By the way, it makes reading your posts a lot easier if you do not use the 'code insertion' tool to format them.