After customers get used to using your product, it’s easy for them to fall into a rhythm of complacency and stop thinking about the value your app adds to their daily life. Use milestones as a way to bring the success and usefulness of your app to the forefront.

You can set any kind of milestone, whether it's using a feature for the first time, an annual anniversary, or a 500th login. YouTube, for example, congratulates users when they pass 100 subscribers.

Regardless of the occasion, milestones create an opportunity to offer users something special in recognition of their continued engagement.

It serve as reminders to the customer that you’re thinking about them and you care about their engagement, even months or years down the line.