Advice for next steps with an app

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I launched an app about a year ago (http://ift.tt/1K5qtmZ) and it received some notoriety including a good write up in Lifehacker and a decent amount of users as a result of that. The app has a great user retention rate, but getting a steady stream of new users is becoming more difficult. Besides adding new features, what are some ways I can continue to engage new users?

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