Why not start a motivations ritual.
Do you have something that you do when you need a little motivation?
We have our everyday rituals like starting our day with a cup of tea or coffee, organizing our work space, reading and answering emails. We know when we go through this process that are day is beginning.
Try coming up a ritual that is yours and yours alone. Something that signals to you its time to get started, or put in that extra effort. It could be something as simple as reading a motivating quote, listening to a certain song, or taking a walk.
Whatever you choose as your ritual do it every time you need a little motivation. The more you do, the faster it becomes a habit.