look, i have been around 3 years on cgtrader and i have learned that what you need to do is just to make and upload with what ever price you want but make sure people see it.
then after you forget that you have uploaded something and upload more and more and then forget it again.
a time will come if some one is looking for some products and you have that so he "will" buy your models.
so in conclucion, all you need is to make quality & quantity and then wait for someone in need.