Right now besides the obvious. Pacing and including action, a goal in every scene, conflict, and stakes. Sometimes I throw away scenes without putting nothing at stake. I am then afraid of holding the reader's attention. A good example of this is having a character not deny a desire of a character thus creating a roadblock for that character. Readers want danger, conflict, troublesome situations. The decision a character makes should almost always have consequences. I argue if you do not include these parts, maybe the story will be stillborn to readers because they must care for what happens. To read the next page and make them turn it, you need danger as well. I also had for my shortest story more attention-getting devices and wondered why those replies were spot on. I felt they were more heartfelt. After not reading it for 1 year. It reminds me that the story is full of action. By action I mean worry. It was my first published short story. It had little feedback and yet it clicked as in it worked. Also to have cause and effect you must have danger. A chain of events that creates more material for a longer story than a shorter story. Of course, when you decide to end the story you tie loose ends. But the central conflict must be important enough so as to write a long story, that complicates itself because of the different kinds of conflicts: society, character, inner, and the others if possible.