I don't feel there is any singular purpose that covers everyone. And, I believe that life's purpose can change over time. When I was younger my life was meant to be fun and enjoyed. Now, my life's purpose is to take care of and provide for my family.
I could write forever on life. There is no purpose, it is. You are here, making a contribution, to this site. You connected with me, I answered. I filled a brief moment of my life with answering your question.
To serve GOD (which also serves the betterment of the whole world).