long tail keywords and duplicate content (product description)

Hi SEO pro's, how are you doing these days? Hope everything is fine...

Let's get down to business: I've got a little question about ecommerce sites with duplicate content (product descriptions). I'm already ranking top #1 for exact keyword matche's (did a lot of backlink work with exact keyword). That's fine.

The question is: long tail keywords still getting lower results than the competitors, because they published the content first. How to beat them? What I need to do/work to outrank competitors on long tail keywords? (I really need this because almost keywords/products from my niche only have 10% of exact search's).

Hope someone can give me a word of light on this!

Thanks!

It is much much easier to compete with long tail keywords. Try posting articles in your blog with the targetted keywords in anchor links?