Hi,
You might want to mix between Adsense & Bidvertiser on your site. Put Adsense on your prime spots and Bidvertisers on the spots that you like to advertise in, but you had already run of the number of Ads allowed by Adsense. To find more how to mix between the two without going against the TOS you can check
Can I place google ads on the same page as third party ads
I hope my answer help.
Enjoy,
Diggmee
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