As a writer you will need to make choices in how you tell a story and one way is by just doing it. Microfiction can help you with that skill.
It can be easy to forget why you are writing when you are working on a full length novel. Try some shorter pieces to work some difficult scenes in your story, or to have a break, or to try a scene in different ways. When you get fed up add a little irony or absurdity or satire.
Most importantly, to be a good storyteller have some fun and enjoy what you are doing.