I know I need to write even when I don't have inspiration. Writing is work just like everything else. So, I am using The Writer's Idea Book by Jack Heffron to prompt my creativity.
Writer Thomas McGuane goes to his study at a certain time every day and stays there for a scheduled length of time. He sits at his desk. "I don't have to write," he explains, "but I can't do anything else." Try his approach for a week, scheduling a specific time, during which you must sit down at your desk or wherever you write. You don't have to write, but you can't do anything else.