The Circles of Control, Influence and Concern model helps us to direct our energy and focus. If we put our time and energy into worrying about the things that are in our circle of concern we will continue to feel out of control and helpless. But if we put our time and energy into our circle of influence and our circle of control we will give ourselves a sense of agency and feel more in control, so this is where we need to focus our time and energy.
Read the related article Circles of Control for detailed instructions