There's nothing very with your models in particular, except that majority of them falls in furniture category. This is most competetive and overcrowded category of them all. And largely underpriced. If you'd look at analytics tool that is available for cgtrader's sellers, you would see that furniture category has the most models in it, one of the lowest average price, worst liquidity and - no surprise here - worst value for effort. It's not worth to model furniture models for selling at stocks at all, unless you're capable to deliver outstanding quality, insanely detailed models and pump them at mindbogling fast rate. Besides, i doubt that many goes to cgtrader for furniture models, when there is 3dsky, design-connected and such.
Bottom line - you won't became rich by selling furniture models. Look at aforementioned analytics tool and try to pick more profitable category, but remember, models that are easy to make, usually are hard to sell. You need to put significant amount of effort if you want to be rewarded :]