Why my models are not selling?

It has only been up for a few months, it will probably get more sales, but not regular sales. Models usually only sell a few times a year, unless you have a model that is an outlier. I would suggest increasing the cost, so that when you do get a sale, it's alittle more worth it.

Hope I was helpful, Locki.

Hard to understand the details of the keyboard. All too dark.
Even if it costs only 2$ I would better buy something more expensive with good clean renders where I can understand what I'm buying.

try adding more formats especially .max,.fbx and obj.i noticed you have an inadequate amount of words in your description box, try writing 100-150 words, the higher your model score is the higher your chances are of getting sales.
upload more models, at least 5 models per week.