Here are somethings I do during slow times that may help you...
1. I work on my social media presence. I can be found on instagram, facebbok and pinterest
2. Create new product...More listings and more options equals more sales for me
3. Fine tune listings. I edit and update old listings during this time.
4. Product Photography. While my product photos are far from professional I am always working on ways to make them look their best within my capabilities and what is affordable to me.
5. Keep a "journal" of what I would like to accomplish and keep moving forward.
6. Keep business cards with me, in case the moment should arise while I am out an about that I may need to or have occasion to promote my shop (my 2 little girls wear my product sometimes)
-Hope maybe this helps you some or at least points you in the right direction.