need to make a service based app

As a project owner, I'm looking to design an app that provides a specific type of service. I'm not sure yet exactly what type of service the app will provide, but I am seeking help in further fleshing out this idea. The app will need to be available on both iOS and Android, and also include user profiles as a feature. In addition, I may need help with incorporating any other features or integrations, such as in-app payments or third-party API integrations. If you believe you have the skills and knowledge needed to create and publish an app of this type, please reach out to discuss the further details of the project.