Another way of looking at human purpose is to say we are destined to try and maximise the value of our life. This may be conceived in different ways (religiously, serving others, partying, personal development, earning money etc etc etc). There are as many different conceptualisations are there are people, probably. I think the answer is objective, and there are right and wrong answers. For instance if one starves to serve God, and finds value in being of value to Him, but either God does not wish for that action, or God does not exist, then the apparent value of starving is an illusion. Or if one parties to maximise happiness, but ends up with liver problems, then maybe the decision was not so objectively productive in the long term. So there are different concepts of maximality, but all cannot be equally true - assuming that the claims are truth apt in their own way (ethics and axiology are undeveloped branches of physics, and perhaps must remain philosophical, lets put it that way), but I think they are.