1. as you were told already, with collection of that size, regular sales are more of a lottery than a granted thing.
2. i suspect that there were certain changes in CGT searching system, as i'm seeing major decline in my sales over past few months, while some sellers at the same time are doing better than ever.
3. your prices are already low and you're offering big discounts on top. I would suggest to focus more on models' quality and its value instead on its price.