Think about what we tend to do least of on a daily basis.
Is it doing your admin? Is it promoting your work by calling up people? Is it exercising in between long desk-based creative sessions? I’ll be willing to bet doing absolutely noting at all is actually something you barely do.
When was the last time you stopped everything you were doing and just stopped thinking and doing?
Sit there. Relax yourself. Be with yourself. Observe anything that comes to mind.
See how you feel when you do ten minutes of this. You will be motivated.