There are a few things:
1 - Write consistently. The more content you have the more search engine traffic you can pull in.
2 - Write with quality in mind. This will help bring in readers who come to the blog more frequently.
3 - Have an opinion and don't shy away from controversy. Being edgy or controversial will explode your traffic if done correctly. If you think that player "x" on the New England Patriots is bringing the whole team down then say so. Haters will show up to your site, but so will an increase in traffic.