You could follow or like the products/shops that use digital items.
I use a lot of digital arts and sometimes, digital art shops get my attention when they like/follow my shop. Some also message me with a coupon code. It might be considered spamming, but I personally don't mind. I hope that helps.
My point is, just keep in touch with your market, which is the other Etsy sellers who use digital arts. (:
-Khin