I have seen many cases where partnerships did not work out because publishers just don't care about the success of one site. They care about the benefit of their network and upsells more than about anything else.
I know of 3 guys that I adviced to leave their partnerships and create their own projects. Took them time to learn, but in the end they all did very well on their own.
Another field to expand content production to would be marketing. Produce images that are used for ads. One image can be worth tens of thousands of Dollars if shot right. Of course it's difficult to find buyers, but hey, it is worth it imho.
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