Balancing this line defines the human experience in my opinion. Objectively it is true, we are minute. But humanity is in the subjective making of meaning. That opportunity to make your own meaning is an incredible one if you choose to accept it. If you don't, it's not, and depression/nihilism results.

And the funny thing is, those who hone that strongest sense of subjective meaning and well being in how they see the world, are the ones who make an outsized butterfly-effect impact on the world, coming closest to overcoming that objective meaninglessnes.

So basically, imo the answer to why do anything? Is because you believe something is worth doing subjectively/on faith/on instinct. Only then does it have a chance to build toward a more objective answer to why do it, in its impact on people & history.