Hi Mayra,
It's kind of a catch 22 situation with eBay, you need competitive prices to attract sales. Now of course there are other factors that play into successful eBay selling, but price is right at the top. So with eBay, it's not just about driving traffic to your listings, it's about being able to convert that traffic into sales.
Can you send me a link to one of your listings and then also send me a link to one of your competitors listings as well please