In trying to figure out life, it strikes me that the part doesn't need to know the whole in order to be the part
David Mamet states this idea well in his book On Directing Film. He says a scene doesn't need to do the job of the play—it needs to do the job of the scene. A line of dialogue doesn't need to do the job of the scene—it just needs to do the job of the line. He says a house is built the same way—a door doesn't need to do the job of the room, it has to do the job of the door. A nail doesn't have to do the job of the door, it has to do the job of a nail. Etc
In the same way, I (as a person living a life, living a day, living a moment, living a single breath) do not have to know how my life, my day, my moment, my breath fits into the whole (whatever that is)—I do not have to know the whole in order to know everything I need to know about the part. I do not have to live the whole in order to live the part
I have all I need to live this life. I don't need to know how this life fits into anything larger (the universe, the existence of aliens, the afterlife)—it's just not necessary. Maybe that's why we don't know these things innately! But not knowing the answers to greater questions certainly can't stop me from proceeding with the now!