Hi SuzannePhilomena,
Welcome to the Apple Community.
Wondering what is causing the difficulty ...
.... perhaps you could ask a friend or relative to help work through the steps below.
Now, we are all Apple users, like yourself, in this community, doing what we can to help troubleshoot.
We don't know what "every possible way" that you have tried really means,
Apple support have articles online (links below) that you could follow, to success.:
The main article to follow:
Change your Apple ID country or region:
Says:
Apple ID Balance
Before you update your location, you must:
______________________
(1) spend your store credit, (or you can ask Apple to make it zero, if you want)
What you can buy with your Apple ID balance
https://support.apple.com/en-us/HT211187
or, if needed
Here are two ways you can remove all your Apple ID (Apple Account) balance:
(Discussion thread: ..... Scroll to reply from Limnos)
https://discussions.apple.com/thread/253058070?answerId=255739415022
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(2) cancel your subscriptions :
How to cancel subscriptions from Apple
https://support.apple.com/en-au/HT202039
If you tried to cancel a subscription but you can't see it in the list
https://support.apple.com/en-au/HT212052
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and
(3) get a payment method for your new country or region (see below).
"Payment methods that you can use with your Apple ID:"
Learn what forms of payment you can use to buy music, movies, apps, books, iCloud storage and more …
(Scroll down to find your new country)
https://support.apple.com/en-au/HT202631
Now for the Complete article:
Change your Apple ID country or region:
https://support.apple.com/HT201389
Check through:
"What to do before you change your country or region"
for anything else that applies.
Then, when everything isin readiness ...:
Follow the steps for "Changing your Country"
either on iPhone, or iOS device
or on Computer,
or online in your Apple ID.
If needed: There are troubleshooting tips at the bottom of that article.
Also, if you wish:
Contact Apple for support and service:
See a list of Apple phone numbers around the world
https://support.apple.com/en-us/HT201232
Or
If your new country is not listed:
Apple Assistance:
Choose your country or region:
https:/https://support.apple.com/en-au/HT202631
All the best :-)