Also, just because you advertise your forum once on a promotion forum doesn't mean anything. Stick with that promotion forum for a long while so members will take you serious there, and they'd probably would be interested in you, your style, ad our forum in general. Get active in exchanges everyday, and whenever it's time to order a new package, then order the largest one you can afford. Get a review for your forum as well to tell what you are missing in your forum to have potential and appealing. Just don't give up. It makes no sense to just start something, go 75% of the way through it, and then just trash the whole idea in the very end. The same thing will happen if you get another forum; you'll go 75% of the way, give up, and trash it. Stick to with your current forum. However, it's pretty cool to have more than one forum. Why not you just keep the one you have already, and promote it on several promotion forums- then get another one you want and promote ot on the other promotion forums. On some promotion forums, you can just advertise both. Plus, members don't come to promotion forums just to look around at cool sites; they come to advertise- just like you do and everyone else as well. Users come to get their forum promoted, but just presenting the forum in the Forum Presentations, then leaving isn't gonna cut you out. Like I stated before, become active in community services such as exchangements, affiliations, packages, etc., and try your best to submit your forum into many free directory submittion sites that you can; if you do that every single day, you'll definitely promote better.
By the way, if you don't have any topics or posts that guests and registering members would like to reply to, then there isn't no sense into them joining. Could I see the link to your forum to understand what's going on?
Thanks!