Short answer: I’d keep those bits of story, especially if they’re on your computer, because you never know when they might be useful.

Long answer: I have lots of bits and pieces of stories collected in an “ideas” folder on my computer. I imagine some of these will never see the light of day, but others I go back to and work on when something reminds me of it or I have a new twist.

Something that’s fun is to read through my notes and see which ideas fit together. Would this character I made notes on in December say this line I wrote in June? What if this character is in the predicament I came up with in February?

In one of his writing books, either Characters or How to Write Science Fiction and Fantasy, Orson Scott Card says that all his best stories came from the confluence of two ideas. So maybe try mashing some of your ideas together and see what comes of it.

Hope this helps :)