Read with a Russian accent

In addition to the suggestions of Ralph and Abambo, I would add that there are already 2.4 million high quality images displayed when you search in Adobe Stock on "cat". In order for your image to be accepted it would have to be perfect and unique. Your cropping, composition, messy background and soft focus can't be fixed in this image to make it acceptable, but frankly, I wouldn't spend a lot of time on shooting pictures of cats for stock. If it's your pet, go ahead and shoot images to capture how cute he is, but without the expectation that it could saleable as a stock photo. 

dont crop off the ears! Crop in. Cleanup the background. Add sharpnes..

You need to clean up the background before snapping the picture, and you should not overexpose. Look your histogram. Your missing part of the shadow area and the complete black area (left).

Adjusting that will enhance the picture a lot.

The eyes are not in focus. Portraits need to have the eyes crisp sharp. To enhance the eyes further, you can then lighten-up the eyes, but keeping the pupils black.