I would write a well researched blog post in any niche except Legal or Car (I find doing research in these fields really boring) I would also do keyword research and target long tail keywords you would not have thought of. However, this service is for people who understands its more than just ranking for keywords. Even though i would be sure to use best SEO Practices when writing, i would also ensure that my articles are informative, entertaining and witty. "You want them to stay long on your site? Then my written piece is all you need" Good thing is, i am open to corrections and would edit my works t fit what you want till both of us are happy.