Given this dashboard, what insights can you offer to the product owner?

Our first customer has started to use Churndler and these are the results (published with the customer consent):

It seems that most of his users want to cancel their subscriptions because they don't use the product as much as they expected to.
Now that we know the main reason for user churn, we can understand why users sign up and pay but don't really use the product. We can also come up with solutions on how to make the product more useable. We can even dig deeper and interview some of the users on their personal discovery process, which will help us understand better how and when to communicate the product capabilities.

What would you suggest to the above dashboard product owner?