You can use ready-made frameworks or templates for developing mobile applications, which can significantly reduce development time. But here, of course, experience is needed and preferably a development team. Since it is much more difficult to achieve results alone. If anything, I can advise the guys on developing React JS applications https://stormotion.io/react-js-development-services/. They have experience in working with various projects and provide services for the development, testing, implementation and support of applications. In any case, this will not only speed up the launch process, but also give you guarantees about the quality.