wow that is an awesome start to a new blog. hope that you have continued success. continue what you are doing and see if it increases more. sometimes changing things to much may have a negative effect.
With few articles and thousands of visitors, comes 2 very simple cases, that I have used in the past. 1. Video Blogs - People will never ever stop watching NEW MOVIES. Make a blog embed videos and spam different places with your link. 2. Warez Blogs - Requires no SEO no work, you get 5-10k uniques a day, because people will never stop downloading free stuff.. That is how I see it, or unless it is adult videos. New blogs with 2-3 articles requires some time to become famous, unless you are on top 10 diggers and spam the crap out of them. But anyways you should try to sell affiliate stuff or your own product.
2 articles daily. Embedding videos is a great idea. Especially if you make them yourself and open a youtube account.