OK, I just took a quick look at your shop, and renewing isn't what you need to be doing. I have to believe you aren't getting found in search, and that's a relevancy issue, not a recency issue. Save .20
Your tags and titles need some work. Make each tag a phrase that someone would type into the search bar if they were looking for your product. You have 13 opportunities to reach the person, so make every phrase a good one. Then make your title using the tags. It will help people to find you when they are looking for what you sell.