Rather than using Google Contextual Advertising, try using some Google Text ads, they can have a much better conversion rate.
Oxado Is a Good alternative to Google.
You can also try using a few banners for affiliate programs, making sure you choose banners for sites that will appeal to your sites visitors. Don't include banners with a high payout if your visitors won't even bother visiting them. Lots of small sales makes more sense than just hoping for a big sale.
Affiliate Network - Webgains Is a good site with a great selection of programs.
Everything takes time, 50 uniques a day is a start but will not generally make much money, so you need to concentrate on building traffic.