Idea 5: Always be Building a Contact List
Your website should have an opt-in email feature. If people like your app and you offer to provide them with answers to their questions, sneak previews of your upcoming apps, etc., they will sign up with their email address. Over time, you can build a significant email list that will prove to be very valuable when announcing new product updates or new apps to the App Store. Your home page should offer an area where the visitor can opt in to receive your product updates.
These are just five ways that you can engage your customers and keep them coming back. Remember, getting an app sale is only the first step. You should think long-term for ways to keep your customers using your app over and over. The more people who consistently use your app, the more sales you will have over time.