1. Hacker News has provided exposure but not a lot of direct business. Sometimes people find us on other channels but recognize us from HN. I would say, don't worry too much if you never front page here.
2. Working on SEO consistently over the years has been our most valuable source of high quality traffic.
3. Work with influencers in your industry. When a popular AWS blogger wrote about Cronitor and was tweeted by their AWS community lead Jeff Barr we added 8 subscribers that day that are still with us.
4. Re-marketing to sign-ups that didn't convert. Every month our product noticeably gets better in some way, and those early sign-ups to our free plan that didn't subscribe have been an invaluable source of later conversion.