You must become a ferocious self-editor. Get a blank piece of paper and spend an hour asking and answering questions like: Who is this book for?
How can I strengthen my arguments? You could also try writing guest blog posts that stoke the curiosity of readers of other sites. This is the part where the writing journal comes into play.
This is the only way I ever get any work done: with a deadline. But the short story form has a particular arc that gets in your head and can interfere when you try to write something longer.
Write an outline to help guide you in the right direction, making sure your chapters follow a logical progression. Here are the 10 things to do right away You want to write a novel?