What I would recommend to anyone who's not happy with a longer work is to attempt to turn it into flash fiction. Because there are so often good things in unsatisfactory longer pieces that you don't want to give up on. Nuggets, pearls, passages... whatever you want to call them... don't ditch them just because you don't like the short story they appear in.
And if you don't like a piece of flash fiction? Well, you can always cut it down to Twitter fiction (a TwitFic) which is what I write on Twitter. TwitFics are tiny stories that fit within the parameters of a tweet. So we're talking maybe three, more likely two, and perhaps one sentence, but if the words work and you like them, give it a try!