Optimizing 169 articles (Black Hat SEO Methods)

I have 169 articles live right now on ezine. They were at one point averaging a couple of $100 a month but now i want to optimize it on the search engine. What black hat SEO methods can i use to rank these articles.

Ive seen articles that rank number one for a simple search term such as "acai berry".

Many of my articles are already converting with the little bit of traffic im getting.

Let me know any methods for seo on articles..

Well in this case blackhat = SPAM

That should pretty much answer your question.

would it be effective to rank my articles or should i just go the white hat way?