Looks like my app was finally approved, and it is no longer blocked when downloaded or launched (still can’t believe it). I hope it won’t be blocked after this message 
A huge thank you to everyone who helped me solve this issue — I truly appreciate it 
To Microsoft: if you genuinely want more new apps in the Store, you need to improve the verification process for independent developers. While I fully support all your security measures and policies as a user, as a developer, I believe modernization is necessary because not all developers and apps pose a risk to end users.
To developers: unfortunately, I don’t know exactly what or who helped me (as I have reached out in many places and spoken with many people over the past few months). But one thing I know for sure — never give up (even if your messages/questions/accounts are ignored/blocked/removed) and always strive to make your product the best it can be.