Reviews and ratings are very important on the App Stores and you don't have any for your app yet. It's a bit of a chicken and egg type problem to get those first reviews but they are really important. I don't know of a good solution for getting genuine user reviews reliably other than asking in-app. That's something that's done often in iOS apps, but I haven't seen it in a Mac app. It can be annoying and intrusive so it's definitely something to consider carefully. I don't have your app, perhaps you could suggest a user review in an intro screen that comes up the first time your app launches?