Here is some tips which will help to improve your Alexa ranking.Follow these tips and see result within few days...
1. Update your site regularly
2. Write unique posts for you site
3. Claim your site on Alexa
4. Download Alexa toolbar on your browser
5. Create an Alexa widget on your blog
6. Write an Alexa review on your blog
7. Get Visitors From Webmasters and Bloggers