Low CTR can be affected by the ad format you are using or the location of your banners. For example, pop ads get 100% CTR, while banners get lower CTR, as not all users click the banners.
In order to get higher CTR, the most important thing you can do is increase the volume of your traffic. We usually work with around 5,000 impressions per day.
Also, please take into consider that we are a CPA based ad network, so in order to earn - you require to send traffic that can actually convert into actions.