Your prices looks pretty adequate to me. I would strongly advice against lowering them. Of course, to lower the prices is the easiest way you can try, but also it is the worst thing you can do. In the long run, global price reduction will hurt everyone, even the customers. What you can try instead, is to rise your visibility in the market - work on presentations of your models, advertise them as good as you can (no, cgtrader forum is not good place for that), try to attract maximum traffic to your shop. Remember, lack of visibility is the biggest killer of the sales, not a high pricing.
Also, if you're in process of expanding your collection, consider to explore different categories. Now your collection is exclusively focused in furniture - thoughest category to compete in. Try to venture in to sport, science, space or even animals/characters categories, if you have skills in organic modelling.
Keep your chin up and work hard towards expanding your collection in quantity and in quality - sales eventually will come. Just don't go the way, like this guy does: https://www.cgtrader.com/furniture-collection