Pro-version of the mobile application or make a paid upgrade?

Question

Marketing

There is a free mobile application with about 50,000 downloads, an average rating of 4.3 on Google Play (1700 ratings), the second one for "Chemistry". I plan to release a new version with a significant expansion of functionality, new design, etc. I'm thinking of selling. What do you think would be more profitable: to make a new Pro version or to release an update for an existing application and put a price on it? Will the app stay in the top after setting the price? There is an idea to make the paid version free for the first days, after downloading, in order to use it, you must first tell in social networks (such as Pay with Twit), will this give a good return?

Answer 1

Leave the free version, add an in-app purchase to unlock extras. functionality.