It all comes down to your eCPM, which comes down to your geo sources, ad placement, refresh rate (banner), ad frequency (interstitial) and of course CTR.
Tell us your eCPM for banner and interstitial, along with the information I listed. Then we can give you an idea of what to expect and how to get the best results.
Well I wouldn’t go higher than your 65 seconds refresh rate. You could try it a little lower like 45-50 to see if you earn more that way. (DO NOT MEASURE VIA eCPM WHEN CHANGING REFRESH RATES THOUGH).
CTR of 0.5%-2% is what most people get. What’s the actual average you get?
$0.20-$0.40 eCPM can be good or bad, it depends on the geos you traffic is from. Can you supply your main countries?