[HIRING] Figure out the user aqcuisiton channel of this app for $500

Hello! We are hiring an individual or a team of people to figure out how the app "21 questions" got 20,000 users last month (https://app.sensortower.com/overview/6451004192?country=US). They have two Instagram accounts (as far as we know), but their cumulative likes (under 10k) is far too low to...