Waiting is the name of the game when it comes to stock photography, there are no shortcuts.
When I first started three years ago I joined
Alamy with a handful of images after passing their quality control I was over the moon thinking that my pictures will be all over the magazines and billboards the next day, guess what ? far from it it took me 7 months of doubt to see my first sale and it was this
one I started reading so many forums specially
Alamy Forum which is a treasure of information coming from experienced stock photographers who played this game for a while and I learned that you need to add volume, the more you submit the more chances you have of selling.
I keep my chances open and diverse my subjects and I find it helpful, one thing I try to avoid is that I don't look at how many pictures there are of the same subject I'm shooting already, if you want to submit pictures of business woman go ahead and do it even though they have loads already on the website, I sold many pics that I thought their subject was over saturated, but hey they sold there is no reason why the editor will not pick your image for his layout.
Make a habit of submitting weekly, I find it a good way to increase your numbers and maintain your quality and let sales start rolling.
Keep on shooting
Cheers