You are very welcome.

"Display rate" is a probability that your ad unit code is present on your page (as estimated by our bot). If you leave your ad unit on your page long enough, it will grow to 100%.

Regarding maximizing your earnings, there is no trivial answer. Your income depends on advertisers' spendings and is affected by uniqueness, quality and volume of your traffic and other factors. Just try to ensure that:
- your ad unit code can be located on the specified URL
- your traffic is unique in the scope of A-ADS, it converts, and advertisers want to buy it