I thought this would be an interesting topic because its something I am working on doing.
Create a good profile
A well designed header image
A full public description of your store/brand, with any relevant keywords to help yourself be found in zazzle search
A link to your website / social media profileCategorized products that make your page easier to navigate
Volume is key to creating a successful store on Zazzle
If you have lots of designs there is more chance of your store being discovered by someone.
I would also say have a blog you never know who sees your designs.
Post your products on Pinterest
Here is my store: https://www.zazzle.com/daytonarts