For that, you first need to define your matrices. Sometimes what looks like success is not success just a bubble.
What is the definition of success for you?
Getting enough no. of customers?
Getting consistent growth or contestant numbers.
Is it due to temporary growth or your customer is staying? Basically churn rate.. etc.
''When you identify what a significant number of customers are actually willing to pay for, then your company has a good shot at making it. Once that happens, you have the sign that your startup will be a star.''