I'm reminded of the following quote by Alan Watts from The Way of Zen:
To the Taoist mentality, the aimless, empty life does not suggest anything depressing. On the contrary, it suggests the freedom of clouds and mountain streams; wandering nowhere; of flowers in impenetrable canyons, beautiful for no one to see, and of the ocean surf forever washing the sand, to no end.
On the contrary, the only times humanity doesn't sap me of the will to live is when I'm dealing with people on an individual basis.
> All that wander are not lost.
I feel like you're misunderstanding that quote as well.
It's supposed to be "Not all who wander are lost" and it refers to loners, wanderers, vagrants and explorers that never settle down and 'plant roots'.
The idea being that there are plenty of people that exist like that and enjoy that way of life. Other people with families and steady jobs tend to look at them as if they are 'lost', without truly understanding what it is to walk the earth.
As far as individual contentment, it seems maybe the truest greater purpose is actually itself: the greatest purpose is to have a greater purpose that your everyday purposes are acting towards. This gives a consistent mechanism I think, but still incomplete, or is it? Its incomplete because the "why" of the greater purpose doesn't seem to emerge from it existing. But this was mentioned at first: the why is for individual contentment, or more technically, for positive consciousness, joy, happiness, love, whatever you want to call it. The sort of existence which when you are it, you don't need or care to ask about a greater purpose, because you can feel..you know, that you're fulfilling it.
What purpose are you seeing?