One sale in the first month is good. You're doing everything right. Great photos, to start, which is the most important thing.
Typical suggestions:
1. Add more items. More makes you more visible.
2. Add an about section. Show photos of you folding, of your work space, of you...
3. Use multi-word tags, not single-word
I'm wondering if maybe you need to add to each listing something about how it will be shipped to ensure it isn't squashed. That's what I worry about when I think of buying origami.
Good luck! Use this slow time to produce and list!