For Native campaigns, the main key performance indicator that we look for is full delivery of ordered impressions.
We set up Native campaigns to serve to the Native inventory channels you have requested. Delivering ordered impressions in full to these inventory channels is what we are going for in running Native campaigns, not CTR necessarily. We are building out the campaign for optimum success in achieving this delivery by serving ad impressions to the specific Native inventory requested in the hopes that the people viewing content on these Native channels will see the ad.
Also, we recommend swapping creatives every month-six weeks to keep the CTR of any campaign high. If we have been running the same creatives for a longer period of time on any campaign, it's possible users have grown used to seeing the same ads and are not engaging as much. We recommend sending over new creatives with a strong call to action to improve this metric overall. We will continue to monitor and optimize campaigns to ensure optimum campaign performance closely.