Discovering your life's purpose through the Japanese concept of Ikigai, which combines passion, mission, vocation, and profession, can lead to increased income, better health, and a happier life. By answering four key questions - what you love, what you are good at, what the world needs from you, and what you can get paid for - you can identify your Ikigai, which may evolve with age and circumstances, guiding you towards a fulfilling life.