The AHA moment is the moment, when users first realize the value in your product. Keep in mind that the longer your time to value (TTV) is, the more likely users will churn.
To find out what your AHA moment is, conduct user interviews, learn from churned users and analyze your data. Once you find the actions & behaviors that directly correlate with value discovery, you will be able to get your users fast to the AHA moment. Here are even more pro tips how you can find your products' magic moment.