I browsed your store and didn't see anything wrong with your designs, I really like your folksy bluebird one. What I noticed is your meta data is mixed up. Every product with the folksy bluebird was described and tagged as a throw pillow. On some other designs I clicked on that were pillows, they were described & tagged as t-shirts and wall art. ...
I'd guess you're using "transfer this design" (no problem there) but when you use that method all the meta data copies over, too; you have to manually edit the tags & description and title to match the new product or you end up with the type of mismatches you have and that effects how/where you appear in searches. If someone's searching for 'something something pillow' and your 'something something card' comes up because it's tagged a pillow they'll go right past it as they aren't looking for a card. Take some time to sort out your tags & descriptions and see if that helps.
Also, for AI generated content, Zazzle asks here that
• All designs that contain any AI-generated content as part of the final composition should be appropriately tagged as “generativecontent”. This will help us track trends and usage in our marketplace.
The marketplace is extremely saturated, there are millions of products on Zazzle alone and Zazzle is just one of many PODs. Unless you are heavily promoting your own items outside of Zazzle, it's going to take more than a few months to gain any traction. Patience is key, after of course thoughtful designs and good meta data.
