You don't. The truth is many people get through their lives fairly happily without ever finding out what their true Life Purpose is. My father, Jack, is one example. He lived a full life he enjoyed until his health deteriorated. He died two months before his 95th birthday. A life that long would take at least a book to share but just so you can get an impression: From Herefordshire (UK) he went to southern Rhodesia with his 1st wife (he had 3) after serving in WWII, at a time

Ever gone chasing after what you love only to find yourself losing interest in it after a while, thinking "...this isn't what I expected. Where's the fun?" The problem with not knowing your Life Purpose, what truly fulfils and satisfies you at your deepest level, is that you'll dive deeply into your passion, what fascinates you and excites you, and for a while that enthusiasm will carry you over the icky bits, the challenges along the way, but as time goes on you'll start to