Well mostly you will get a lot of viewers but the ratio of them clicking is always low. Although for 500 I think you should get a bit more. Focus on your Ad placing then since they must be somewhere @ the wrong spot, you can try the Google heatmap but experiment. Use the bigger Ad Format, the large rectangle. Color, if done right and blended correctly with your website can really help too, etc. I has guide too.
You can do several things to improve your earnings 1. Place ads on the top 2. Use 336 X 280 square Ad 3. Try different color in ads Hope that helps
You gotta find out what is the reason before you can correct it. Less click majority due to 3 causes (can be more) 1. Non targeted traffic/ low quality traffic - you can't expect cluck from them, you need targeted traffic like se traffic to get more click 2. Crap content / slow loading / website quality etc - focus on improve your content and onpage optimization before think about getting click 3. Ads placement - this is the best case, you just need to play around your ads setting/placement to find the best ctr
Ad placement is key. But also structure of the site (how you organized it, where's what...) I hope your site is not the first in your signature. Not well organized.
Try putting the large square ad between your article title and the content. This would increase your CTR.
this happens so many times especially with my site too , more visitors and less clicks , keep your adds on top of the page that helps for clicks.
If you are getting more unique visitors, try to place the ads with your site theme color. So that you can get more ctc to earn more.
Another ideea will be to ban some of the adverts that are being displayed on your website - if they are not performant, maybe other ads will have a bigger ctr.