One thing I noticed that is destimulating sales of new models and uploading them, is an algorithm prioritizing older uploads no matter the number of views, likes, or sales the new model gets. For example, I recently uploaded a couple of models like Messi bust that is selling well but is still at the bottom of the search even though it is getting a good amount of views likes, and likes.
Another example is the model of Nadal I uploaded yesterday. I would expect a new model to be, at least for a few days, on the top of search engine but of course, it is at the bottom of the page.