If you can’t motivate yourself, then you don’t really have to. Organize your life in a way that let you feel motivated. Maybe you are not enjoying your current work, finding it dull and mundane, then it’s about time you think about getting a new job. You want the motivation to be a backup to your career, rather than a daily routine. Something that could make the flow of work goes more naturally could be passion. Choose to do things you have the passion for or work towards it. Find things that you like to do, that you want to do. If life is just a chronic chores to you, then you better find something to live for, as much as we have more things that we all don’t want to do.