Ok.. don't take this the wrong way, but you really aren't selling your service very well at all.
Look at the other writers here, you are facing some
stiff competition.
Why are you only prepared to write about celebrities? Doesn't make much sense to me. What are your prices and time scales? How about examples? You really need to give potential buyers a lot more information and - in this field - a lot more choice too.
GL. But I think you might be better selling elsewhere. Or.. if you really want to just write about celebs, how about creating a pack of articles about the most popular/searched for celebs and selling them that way. Just a thought.