Is There a One Size Fits All Retention Solution?

There are a lot of people that really ain't notifications and then there are some who love them. So how do you find like a one size fits all retention solution that works with the majority of users? If you're a product manager, realize if you want to send notifications that users are about to churn or not even about to churn. You need to understand what are the events that drive value for the user, notify them on those events.