No one or nothing exist without a source and when a source of a substance is known then “PURPOSE” is easy ‘cos the source of a thing is it’s sustainability.
A car didn’t just jump to earth from the sky someone called “manufacturer” thought & brought the design to be & it’s the only source that understands and can maintain it.

Shoes, Clothes, Food recipes, body products everything that is in existence and will ever be was designed by a source and will be maintained by that source.

Back to the topic for man to know its purpose he needs to look deep and truthfully answer the question “who is my source?” I believe that’s the biggest challenge humanity is facing and that’s why there are so many religion, believes and ideology.

However, from my knowledge purpose can only be discovered or known when you acknowledge your source and connect with your source by asking questions, getting detail about who you are? Then it will be easy to flow, run, become who you are and the greatest source who has ever lived to show the way that every man is designed by GOD for a specific purpose is JESUS he is the only way to the humanity source. John 14:6