I started listing items in September. What I've found is that the more you list - and the more you FILL your shop - the more you'll sell. It can build momentum naturally. Definitely use social media and such, because it will bring new eyes to your shop. Just keep creating. Your items are beautiful!
My approach is not to create based on what I think will sell. I want to love what I'm creating, so I'm creating what I love. I figure if I love it, someone else out there in the vast sea of people surely must love it, too! And, maybe they will either a) not like to create it or b) not know how to create it. In either case, here I am, ready to give them what they love! :)