Apple app store in Bulgaria.

Hello, I just switched from iPhone X to iPhone 13. And now I have an issue, I can't select Region Bulgaria and the App Store, it doesn't show Bulgaria as a country in the list, and I need to use Bulgaria as a region because many of the apps I use are available only here as for example my banking app and etc. How can I fix that issue? All over my settings, my region is Bulgaria. But still when i open App Store it says that my region is not supported, with iPhone X i didn't had this issue.