Obtaining Page Public Metadata Access permission from Facebook can be tricky, as they have strict guidelines for use cases. To increase your chances of approval, ensure that your application clearly outlines how allowing users to add location to their Instagram posts using your platform adds value and enhances user experience. Highlight any privacy measures you have in place and demonstrate how you will responsibly handle user data. Additionally, consider reaching out to Facebook's developer support for guidance on improving your application and addressing any concerns they may have raised in previous rejections. Good luck!