Click on "Explore" and then "hubs". Once there click the following:
Books, Literature, and Writing
Commercial and Creative Writing
There are four or five categories of creative writing from which to choose. That's where you want to categorize any fiction you post. Unless they've changed things, creative writing and poetry get scored differently than other hubs and you don't need to add all of the pictures, polls, etc in order to get a higher hub score.