Think of luck in terms of a surface area. Sure it exists but you can increase or reduce the size of that surface area with what you do. Dont let the thought of 'its just luck' dis-empower you.
More generally, why do you expect reviews when you say there are many similar apps? Does anything of importance stands out in your app vs competitors? The reviewers get bombarded all the time. Have you focused on getting the user experience to the point people promote the app for you. I'd say this is the focus and once this is happening to some limited extent then push the marketing once you have traction.
Also there is always pay to play. You could advertise to boost user number to get more feedback on the product and gain traction if the UX is a promo-table one.