You've run out of steam. We've all experienced that lack of drive at some time in our careers. It may last an hour, a day, or longer. No one likes to feel the pressure of having to finish any project.
Motivation is the key to getting things done and enhancing creativity.
Evaluate your current work situation to see if your environment stimulates you. Here are a few points that may help. Don't let yourself get bogged down with one task that prevents you from doing anything else. With a little time management, you should be able to work on several different activities at the same time. For example, you know your plan of work is due in January.