Images are key. Show off what you can do, show what you have managed so far, include mockups, sketches, whatever. Too many people come to the forum with a story idea and nothing more, unless you give people more to look at, to show how invested you are, they'll probably steer clear.
Also, remember you don't need everyone all the time. You have some people interested, why not make a start on stuff whilst waiting for others to join?
Also, remember you don't need everyone all the time. You have some people interested, why not make a start on stuff whilst waiting for others to join?