First, make sure you're writing to share something in a means to connect with the audience your piece is intended for. Second, even if you only start out this way, use an easy, conversational voice. This allows the ideas, the plot and pieces of your writing to fall into place readily. You can always go back to edit it in parts to give it formality if that's what is needed. My third tip is to step away from your writing table and allow ideas to brew in your head. You don't always need to work it out on paper (or typed straight into the computer). You're giving yourself lots of room and freedom for the best storyline, word use, etc. Fourth tip is to be super selective of your words. Every word counts, no matter the length of your writing project. I know it takes time and patience, but make sure every word you choose is the perfect one in its spot. Finally, and I know you may have heard this over and over again, but edit-edit-edit. Re-read and re-write and re-think until it shines as bright as the sun. You and your writing are worth it.