Writing can be unrewarding for a long periods of time. That is why making goals is important. In completing monthly goals, we know we are getting something done. Also, it focuses our attention on what is important to us at the time. One month might be directed at completing a poetry book, another month might be centered on writing an entire film script.
Don't be discouraged if your goals are not coming along as your ideal would make you believe they would. Be satisfied that you did your best, and that in fact, you did get a lot of work done in a certain area of your work that you otherwise would not have. Without goals, many writer's not only write less, but they are scrambled in their concentration, rarely ever completing something to its finish.