If I look at your backlink profile with ahrefs, there's few I don't like, I am referring to anchortexts stuffed with keywords which doesn't look natural to me, and I assume google would not consider them natural either.
Your competitor pinkcherry doesn't look much better, but that should not give you much comfort. And btw they have much more linking root domains so they beat you anyhow.
It's the on page which is really an issue in my opinion. Just starting with following advices from MOZ page grader would help a lot.
Take this page http://www.cupidboutique.com/vibrators which I assume from your early comment you would like to see ranked better than your competitors for the keyword "vibrators", and look at the source code. Starting from the head there's a lot I don't like, if you want to rank for vibrators, trim the title, that megamenu is overkilling with external links, the keyword density is overwhelming, and 50 h2 tag are simply too much. And content is thin.
You should rethink it. If you look at hushcanada.com page source for their best ranking results for the keyword vibrators you will see it's much much much better.
Pinkcherry rules because of the links, hushcanada beat you because of their onpage.