That's physics/metaphysics. In the physical realm, there is no subjective OR objective reality. There is no "me/not me", or "this/not that". There are no 'parts of the whole'. It's all one unaware phenomena. But there IS another realm of being manifesting within the physical realm. That is the metaphysical realm; which generates all these new possibilities. Possibilities that occur because of self/other awareness.
Our awareness is the product of the working brain, as I said, and the brain is dependent on the senses to ken the outside world, to survive and breed in it, and to understand it. As I also said, in this way, subjectivity encounters objectivity and we have the history of people and within it the history of science.
One of our evolved brain functions is picturing the future; the marksman knows his spear or arrow must anticipate movement, the hunter knows where the game were this time last year and goes there, you can get on the right side of the leader if you make certain classes of joke so you intend to do this ... and so on. Foreseeing possibilities, imagining future outcomes and how to bring them about, anticipating problems, are a kit from the same stable, an evolved compound brain function.
It means the emergence and manifestation of new possibilities that were not otherwise extant.
That is, the thinking up by a brain of such possibilities.
Because every one of our ancestors, back across three and a half billion years, lived long enough to breed ─ and here we are. So is there any objective purpose to the existence of humans? No. But if you're a human, chances are that you'll get your greatest satisfactions from your place in society, your mate and offspring, the skilful and successful exercise of your talents and the camaraderie of your group. One's place in the peck order can be the difference between surviving or not, finding a desirable mate or not; and nearly all primates do this by forming one-to-one relationships with other members of the group, the higher up the order the better. The larger the primate brain, the greater the number of those relations, which makes being a human a complex business; and 'networking' is only one of various manifestations of this instinctive tendency.
What are we to do with this existence now that we are aware of it? What is it's source, and what are it's limits?
We can be our version of a Musk or a Liz Warren or Postman Pete or Jenny da Vinci or whatever; we can do that as our day job or as our hobby. We can, with the usual lapses, lead lives that fit with the instinctive part of our morality and with the acquired part, as good children, friends, partners, parents, neighbors, employees, employers, citizens. The question is there because the range of possibilities is so large.
we don't have the answers. And science cannot provide them, because science cannot investigate the metaphysical realm of being.
Science can tell and has already told us a great deal about ourselves, and how our brains work; and while the mechanics of awareness are still a work in progress, the smart betting says the answer will come from there. As you say, it hasn't come from anywhere else. But at the end of the day only we can make our own choices, so the more we know about ourselves both as humans and as individuals, the better placed we are (it seems to me) to make those choices.