Try the domain with different providers. Imonetize does this for you if you use them but I never made much with them.
You are getting impressive traffic, but if it is not from US visitors it may not help to try other US-based providers. Also what are the visitors looking for and how is your domain optimized? You mention revenue, but what is your CTR? If you are getting lots of clicks, then you need to find some way to display ads that will pay more per click. If you are not getting many clicks, then you need to find out what will make your visitors click.
Are the visitors looking for bookmarking sites, bookmarking services, or something else? If you are getting a CTR over 5% you are doing pretty well on average. If you are below 2% then you need to change your keywords, images, or colors I think. TrafficZ.com let's you do quite a bit of optimization and you can pick 4 different templates to rotate and find ones that work better than others.