What is your reason for either aspiring to be a leader or wanting to be more effective as a leader?
Perhaps you are motivated by the potential rewards (compensation and recognition) that come from additional responsibility. You may decide that developing stronger leadership skills is part of an overall professional development plan.
Alternatively, you may believe that a leadership role is part of a central purpose in your life. It may be important to you as part of a personal identity. You may be driven by a sense of obligation to serve others in some leadership capacity.