Long-Tail SEO Article Creation

I’m looking for a sharp, authoritative SEO article that zeroes in on a single long-tail keyword and helps push my page up the rankings. The focus is entirely on search-engine performance, so every section should be built around best-practice on-page SEO... (Budget: $15 - $25 USD, Jobs: Article Writing, Blog Writing, Content Development, Content Writing, Internet Marketing, Keyword Research, Link Building, SEO)