This was very interesting but I wonder whether all species or even just one actually have a (shared) purpose? As humans couldn't we all just try to find our own?
For me it would be to be a net positive to society in certain ways (that I'm not sure how to put into words and the bits I know how to could get long) before departing.
In a way we are just a very complex system that can reproduce and we are just configured to do so. Life is very good at persevering but does that make it our purpose?