There is no doubt that the apps which have much more users are much more valuable.Then you should simplify or even remove the registration process. Here are some effective ways to gain much more users. Details as follows:

Appeal optimization
Appeal Optimization is very important. You can optimize appeal from the following aspects to increase download rates:
· Creating an simple, memorable and attractive app title
· Using eye-catching icon and screenshots and attractive videos. Graphical elements are always helpful to convince users.
· Writing a great description. Highlight your app features and advantages in first 3 lines. Keep it short and simple.

Gather Positive Reviews
Data shows that 95% users will take the app reviews as one of the most important reference factors to judge the app, and most people prefer to download an app which has much more positive reviews. Here are some effective ways to gather positive reviews:
· Invite families and friends to review app
· Reviews exchange
· Incentivize users to leave positive reviews
· Use some useful plug-in
· Buy app reviews. Bestreviewapp(https://www.bestreviewapp.com/?from=cr-chris) is a reliable provider

Get Featured on App Stores
Generally speaking, people give much more trust to the app stores, if your app get featured on the app stores, the conversion rates will be improved significantly.

Hope the 3 methods are useful to you.