The only thing that has been most helpful is joining teams and getting advice from Etsy's experienced sellers and getting my shop critiqued. Those words of expertise or even the smallest suggestion helped me improve, though I have a long way to go, but it feels great to have a start!
What really helped me is working on:
1. Improving my item titles and tags.
2. Listing and tagging items according to Etsy's merchandising themes.
3. Working on my photos.
In my shop I have: Paper Flowers, Wedding Centerpieces, Bridal Bouquets and Favors, Home Decor Accessories, Shabby Chic Style, Floral Arrangements, Wall Art & Acrylic Painting, Paper Roses & Carnations, Paper Craft & all Kinds of Beautiful Art Pieces. Unique, Elegant, Aesthetic & Artistic. Everything handmade by me. I do CUSTOM & BULK orders too.