Give them what they need to thrive, then get out of the way
From the 99% blog:
What really gets creatives fired up is, well, ourselves. That is, intrinsic motivation. If we can imagine an achievement, see ourselves progressing toward that goal, and understand that we are gaining new skills and knowledge, we will be driven to do great work.
For creative thinkers, [Daniel] Pink identifies three key motivators: autonomy (self-directed work), mastery (getting better at stuff), and purpose (serving a greater vision).
As creative thinkers, we want to make progress, and we want to move big ideas forward. So, it’s no surprise that the best motivator is being empowered to take action.
[G]ive your team members what they need to thrive, and then get out of the way.