Too Long; Didn't Read
Study customer reviews of competitors' mobile apps to identify gaps in existing features that you can incorporate into your product to have a small advantage. Identify current customer pain points and identify what is the current flow the users are accustomed to and what can be made better. Find out what features competitors are offering, can be as minuscule as a slider image, or a button and gauge if it should be there in your product rather than ideating and thinking over the same hygiene features yourself. Study the tech stack of a competitor's app, such as JAVA developers for the backend, or there is some new interesting tech he is using that helps in scaling faster.