If you’re already successful, why would you want to hire a coach? Good coaches can help you see what you’re missing and identify your blind spots.
Coaches have great BS detectors that can help us learn where and how we’re lying to ourselves. They're trained to help people grow. While most successful people work hard, had some luck and are “self-made,” all of us hit plateaus and have blind spots. Many of us have entire areas of potential that we’ve never explored or pursued. A good coach can recognize and help you address that.