The domain's DR/DA score often has a lot to do with the conversion rate. Also, keep in mind that this is a thriving niche, chock-full of high-difficulty keywords - meaning, there are many sites with better authority and a returning customer base.
With that said, I think you need a better logo and should start publishing user testimonials for your products. I don't see any on your site at the moment. Hence, focus on building a more recognizable brand for the time being, not on lowering your merchandise's cost.
It's also possible that a high traffic and no sales problem is because your product doesn't have a demand. Chances are your marketing is good enough to drive people to your site. But, it can't do anything in terms of converting the traffic because the product isn't something they're looking for.
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