I have developed a Trivia app , where user play trivia game based upon different topics and get rewarded with gifts . ( There is no life option)
I am not using any ads to monetize my app right .
Apart from ads what can be the other ways to charge money from users .
Whatever comes in your head , Please drop here .
Your ideas will not just help me out but also the other developers who want to get rid of advertisement model
Can we add commission system like Kodular in Trivia 
TIA
You can develop premium version of your app where you can provide high quality content and extra features.
You can charge users to get extra life or any other features.
You can have life system, and make them available to users by in app purchase
Or
You can offer some game coins in to users according to their success/daily login etc
And also develop a section in which users can buy some title/frames/objects which can be highlighted on their profile from the free coins they receive from game, and if the need more money that need to buy a pack of coins from in app purchase
Final Result: In App purchase
Thank you very much for your opinion but don’t you think premium app goes for only Utility apps ? In a trivia app what things can be premium apart from lives?
title/frames/objects , This is something new .
I have thought about title and frame , can you elaborate or drop an example for objects ?