Start writing about something else. Keep in mind AdSense will need some time to start showing the new ads.
Write about the niche you want ads to show for. They check site to figure out what is on it and show ads related to topic of site.
Since AdSense ads are contextual, if you write about cars you will get ads for cars. If you write about Paris Hilton you will get a low paying ads for Paris Hilton You get it now?
Keep the high paying targeted keyword(s) in your mind and then build your article around it with out spamming the contents. By this way, you can see ads related to your keywords and once clicked by the visitors, you will get more money
Basically, google needs to take times to put ads in your website. So, dun worry.. The important thing you have to do is give a good n quality post in your site.. Then , ads will come..