Ask HN: Got a steady flow of Subscribers. Now how do I keep the ball rolling?

Hello, I recently prelaunched http://eFolio.me two days ago and after being featured on betali.st we now have a good influx of subscribers.

Now I know an inevitable slow down subscribers will happen if I don't act quickly. What are some things I can do to gain more exposure?

I've already started submitting our start-up to other sites and other measures. It'd be great to get some tips from seasoned hackers.