Sidebar Ads in Responsive Layouts – How to make happy both advertises and readers ?

I have a blog and I make money from advertisements.

Currently, Advertisements are displayed on the sidebar only because I don't need to disturb readers when reading articles.

There are two 300*250 ads and six 125*125 ads are displaying currently.

My blog traffic is increasing month by month, but my clients (who give the advertisements to me) said that the traffic they got from my site are decreasing month by month.

I know the reason for that.

I have around just 10-20% traffic via mobile device in 2014. But now I have more than 75% traffic comes from mobile device.

When responsive layouts, my sidebar displaying under the content like all other blogs. So readers won't click the ads.

I want to happy my clients (who give the advertisements to me), because I need to generate traffic for them. If they will go from my site, I can't generate money.

In other side, I need to happy readers also. So I can't display all advertisements before the content.

So is there any solution for me?