Hey there,
There is probably a reason why your models don't sell. There are big differences between how popular different categories are when it comes to selling 3d props. There is a great infographic from 2005 that shows differences between categories regarding prices, competition popularity etc. Check this out:
https://www.cgtrader.com/blog/infographic-best-selling-3d-models-and-practices
I can only second what was said above regarding your category, and it shows on the infographic, furniture models are in fact the highest competition category, with one of the lowest pricing. Looking at your models, they seem great quality, but these circumstances result in only the very best and special models selling. If you are selling low poly props, create Unity package for them also, people love instant easy-to import props and packages with several items, and there are many who use Unity nowadays, not only for games, but for training softwares also.
I have been selling on CGtrader for 3 years, and I have a total of 4 models, that earned me over 6000 dollars. I am apparently working at a company that prefers to buy 3d props over hiring people to make them. And they told me to find a certain type of model for a project. I looked for ages, and it turned out there's nothing out there in good enough quality that is worth buying. So I decided I'm gonna make it myself, and it was selling like candy immediately. My advice is, pick the right category, provide the best selling formats for that category, and make good advertising pictures. It often helps to give your main picture titles, like "low poly", PBR" etc. People often just scroll through models without looking further than the label picture. Make it impressive.
And most importantly, if this is your passion, don't give up on it, you will find your niche that will promote your talent.