The best source of traffic are Search Engines, and that will take some time. You need incoming links to your site, which I'm sure you are getting from all HNers

The best source of traffic are Search Engines, and that will take some time. You need incoming links to your site, which I'm sure you are getting from all HNers and Redditors bloggers that visited you. You also need to learn about SEO and keywords, and write respecting that. Take care of meta descriptions, and meta tags. Write good titles, and urls for every post. But, after all, it is a matter of giving good content, and patience, just wait a little and the organic traffic will start to arrive. Just my two cents, and please consider that I'm not a SEO expert.