1. Plot. "A group of characters discover this awesome world that I worked really hard on" is not a plot. "War is bad" is not a plot. "The paths of several people I think are really interesting gradually converge and/or diverge, punctuated by swordplay" is not a plot.
2. Character. Just because a character is a product of a strange sect, profession, or ethnicity which you have created does not automatically make him or her interesting. If they wouldn't be interesting if you translated them into our world it's a good bet that they won't be interesting in the context of your world, no matter how many maps you have drawn.
3. Voice. Get one. Seriously.