Different mindsets of managers and non-managers

I am transitioning to a non-management role for the first time in over a decade and I am surprised by how different the necessary mindset is. As a manager I was primarily concerned about others and tracked many different issues. As an individual contributor, I am rediscovering the required focus on a single task. I had forgotten what a stark contrast there is between the two roles. It deepens my conviction that the biggest step in a manager's development is the first step from non-manager to manager.

For more on this topic, I recommend the book "The Leadership Pipeline" by Ram Charan.