Dear Sumgen, after looking into your account, we have come to the conclusion that your traffic source and quality is what is holding you back from reaching the CR you wish to achieve. If you improve your traffic quality you'll see a much better result. Our traffic manager looked into your account and traffic sources, and his recommendation is: Many of your users are under the age of 18, you should try to target more specifically to reach a better CR.
I hope this helps, if you have any questions feel free to PM us or hit us up at support.lph on skype!