It can happen that you may start to shoot a story without a precise idea of where it's going. You haven't really explained what you're doing so it's hard to know how to help.
First of all, it may sound obvious but, as a general rule, it's not a good idea to try to tell more than one story at a time.
Secondly, don't expect that if you shoot a lot when you return home you'll automatically have a story. You might end up with a lot of (pretty) wallpaper and nothing else.
This much I can say: since the best stories are usually character driven, I would suggest that – while you are on location – you ought to try to find one or two subjects who will be the protagonists of your story.
Try to tell the the small story as a way of telling the bigger story; what I mean here is that by telling the in-depth the story of your subjects, you should be able to tell the bigger story or how whatever it is relates to them, influences their lives, etc.
If you want more – and more helpful – suggestions, you need to go into greater detail as to what you're doing, why you're doing it and what you expect to say. The answers to these questions might help you restrict your field of action and help you come up with a specific story idea. In any case, if you find one or two strong (and interesting) characters, you'll most likely be able to find out whatever story it is that you ought to be concentrating on.