Have as many listings as possible. Preferably over 100.
If you have multiples of an item and are trying to get your numbers over 100, go ahead and list them as separate listings... just make sure to change the titles slightly from each other so Etsy search engines recognize them as different items.
Learn how to use a camera.
Keep track of what colors & styles sell best and make more of those.
Keep trying new colors and styles whether or not you think they'll sell. It'll help pull more people into your shop and you never know when a new item will catch on!