[Minor49er]

If you haven't done so already, you should write up a couple of versions of a press release and submit them to various news sites (like this one) where your target audience is likely to hang out. A few words about what you offer and how you differ from your competitors can go a long way.

Also, persistence. Getting people to bite can be a long process, and it can be really frustrating to put effort into promotion that results in a small return. If you're not getting any feedback in your promotions, chalk it up to the wrong place, wrong time, or wrong approach. Change one of those variables and try again. But if you see even a small amount of users start coming in, that's good. There's a potential that they will start telling people about your service and the word will spread.