There is a lot that has to be done to make apps available for certain regions. The developer of the app is who determines in which countries their apps will be available, not Apple. Though, Apple will intervene if there is an issue that violates their policies or cause legal issues. But most of the issues surrounding availability has to do with the developer.
There is a way to change your country/region to be able to download the apps available in different places, but in all honesty, it causes more confusion than it is helpful. I helped a gentleman before that had apps he downloaded on a different profile with a different country registered as the main Apple ID on his device and he had a host of issues because of how he used his phone. Likely, Apple has updated their security measures to prevent this kind of use, so it may not even work anymore anyway. There are restrictions for a reason.
The best thing you can do, and I say this from experience, is to contact the developer directly. Many times they create their apps to respond to a need in specific areas. If you reach out and notify them of a need, they may consider updating their app to allow access in your area.