Right off the bat, use "patriotic" and "patriotism" in your USA design tags. I don't know if you're Jewish, but there are relatively few Israel designs, meaning you could focus on for a bit to see if that's a niche you can cash in on. "stand with Israel", for example - less than 5000 designs, which is surprising. Just "Israel" only brings back around 38K, which is pretty good niche opportunity. OK, now for the tough love: I like your designs, but there are a LOT of similar designs in the Z marketplace already, so the squeaky outside marketing wheel will get the grease here. This means you'll have to social market yourself like crazy if you want to gain customers. And, here's some links to typical feedback questions like yours (below). I'm not a social media person, so somebody else will chime in or you can go searching the forums here for tips.
https://community.zazzle.com/t5/general-zazzle-discussion/no-sales-store-feedback-help-i-m-new-links...
