Hi Dani,
Relevancy means that your item titles and tags have keywords that match the words that people are searching. Etsy looks mostly at the first three or four words of your title. The better they match, the more relevant your item is and will appear closer to the top of search, as in page 1 or 2.
So for instance, here is one of your titles :
Set of 9 Shades of Pink 1.25 inch Chiffon Pleated Fabric Flowers with Pearl center Perfect for Headbands Hair Pins Newborn Photos
You want to title it with the most relevant keywords first, since no one will search "Set of 9 Shades" So you might begin the title with:
Pink Fabric Flowers ... and then whatever keywords that have to do with your item following.
Hope that makes sense. Make sure you add keywords in your descriptions and your shop description too. Google will pick those up.