Which mobile ads to use for long sessions?

Question

Mobile development

There are three apps with an average session of 2, 5 and 8 minutes, which is pretty decent in my opinion. Using AdMob ads, I get from 1000 impressions, sorry, 10 - 15 cents, which is clearly not ice. Tell me, is there something in the mainstream now besides banners? I tried interstitial when switching screens, but again - somehow not impressive.
If the information is important, 2 applications are gaming, one is a social messenger.