Some ideas just don’t make it as far as you hoped they would. Take an idea I thought of about a month ago or so, for example. While I still like the idea, I’m not sure I know how to write a story about it. Every time I think about the plot, it only goes so far in my mind. I’m not saying that I’m totally abandoning the possibility of using it, but things aren’t looking good at the moment.
The important thing to remember is that if you really like an idea, chances are that it’s good. You may not necessarily know what to do with the said idea, but that doesn’t mean that you should just forget about it. Keep it in the back of your mind and who knows – one day you might just find a use for it.
Speaking of not getting rid of things, I’ve read (and heard) several times that you shouldn’t throw away old stories or poetry that you’ve written in the past. Sure, you might read it and think, “man, this utterly sucks!”, but you never know when a light bulb might flash over your head and you might think of a good way to incorporate an old idea.
Old stories can be revised, poems can be revisited, and random ideas can be used in some form or another. Be patient and don’t give up! If you don’t know what to do with an idea, put it away in storage; write it down and come back to it. Whatever you do, don’t sell yourself short and don’t count yourself a failure if not every idea becomes a bestseller or even a book at all! Good writing takes time and when you get it right, it’s well worth the wait!