Receiving immense traffic, yet no sales, clearly indicate that the store needs some improvement. Some of my suggestions for store improvement are as follows:
Hope your visitors turn into customers very soon.
You have a good selection of products there. A few things that you may want to change are:
I hope this feedback will help you. :)
The great thing about print on demand is you can have lots of awesome images of people smiling and wearing your products. This gives the visitor a good feeling and they can envision themselves wearing your products. Add more images like that.
Overall good start keep up the good work.