I have 2800 assets in my portfolio but my income is absolutely zero.why so you can tell me if I can not get seel than I leave this site

Your main obstacle, you’re in a fiercely competitive category.

Stock contains over 150 MILLION icon images. Most are sold in sets.

http://stock.adobe.com/search?k=icons

With so much competing content, It’s unlikely that customers ever see what you’re selling.

Try submitting something else besides icons.

I think your problem is your metadata. 
For instance, for this image
 

 You have: a title of: geometric shapes minimalist abstract design, repeating pattern of triangles futuristic graphic. The related keywords that are shown make absolutely no sense.

My personal keywording tool analyzed your image and returned this title: Camera Aperture Blades Icons Set Displaying Variable Iris Settings for Technical Visuals and the following keywords:  aperture, shutter, lens, iris, diaphragm, camera, optics, mechanism, mechanical, focus, icon, symbol, vector, graphic, design, set, collection, adjustment, control, exposure, light, opening, circle, hexagon, geometric, equipment, hardware, technical, professional, studio, settings, black, white, isolated, illustration, element, interface, vision, zoom, depth

I think your assets are just not showing up in the search results. What would the buyer use as a search term to find this image?

We can’t do that if you don’t provide us with a link to your portfolio. And you also might give some thought to your titles and keywords, because it doesn’t appear your assets are showing up in searches. 

We can’t tell you much if we don’t have access to your portfolio or at least of examples of your assets. AI? Photographs? Vectors? Videos?