Cohort analysis case study

Need help with a case study. I need to prepare for a case study interview. The case study is about a online platform application with subscription model (assuming 1 month subscription). I was given a data set table (no. of new user and total no. of users per month from Jan 2019 to Dec 2021) where I have to develop a cohort analysis. From this data set, I am able to calculate only retention rate no. of existing users / no. of total users from previous month) and churn rate. Since there is no other data point, I am not sure what other metrics I can calculate. So I am a bit stuck of what to show here. Am I missing something here?? 
Any ideas would be highly appreciated! 

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