I guess I could come up with a possible list, but these are just speculations. We have no way of knowing that because we have no way of knowing what the purpose of existence is, and I mean the whole universe. Even talking of any purpose is a speculation.
This is tied to what we value, each conditional value dependent on another and finally an absolute one - something we value inherently, in itself.
What absolute one? Purpose seems to be what people use as an excuse to justify their acts.
Something that, all other conditions being equal, is more valuable, better than, than its contrary - to us
So, it's all a human construct. It's all about us. It's narcissism, egotism, exaggerated self-value. Self-deification.
We can follow our own trail of conditional values to learn that which we value absolutely
Relativism. In the end there the only "absolute" is really relative, i.e. how it relates to us. Thus, in the name of the almighty purpose, we justify what we do for us and in our name. But if you strip it of fancy rhetoric, the purpose of the bigger fish is to eat the smaller fish. Not very exalted, is it?
Ask yourself what is all this about? And if you think you know, ask yourself how do I know that? Let me help you: we don't know. We just exist. That's about all we know. The rest is filled in with our fancy.
But what is your purpose in telling me this?