Concerned about site ranking
 

So I've done my keyword research in longtail pro and I've discovered what I believe is a quality niche. Most of the sites on the top 10 are small niche sites or tiny ecommerce sites with low authority.

So I've been building out my site in a standard silo. When I first post my article, my page ranks on page 5ish for my keyword for about a day. Afterwards, no where to be seen. My site is only two weeks old, is that the reason? Will my rankings come back?

May be you have done much of poor link submission.