Your thinking process is full of contradictions. I can't imagine anything more immature and egocentric than holding the notion that this entire cosmos has a purpose, and that purpose has to do with one specific primate species on one tiny planet in a relatively average galaxy in a nondescript area of the universe. Really? That makes sense to you? The universe was cruising along just fine for 10 billion years or so before this planet was even formed, another couple of billion while this planet serendipitously forms an atmosphere complete with liquid water, life begins and evolves into millions of diverse species and creatures that are beautifully adapted to their environment. This all meant little to nothing until about 200k years ago, we show up and now Natural Purpose can begin? This seems like a child's mentality. The cosmos did its thing well before we were here, and it will continue to do so with or without human existence.
In the next sentence you say that nothing is important (it would seem like your Natural Purpose would be important if it existed, but whatever). This seems much closer to what reality shows us. Just because the universe by all indications doesn't assign a purpose to humanity doesn't mean that we can't choose one for ourselves. Which seems to be what we have always done. Human affairs including art, music, love, science, etc., doesn't have to mean anything to the universe in order for them to be important to us. Our importance seems subjective, not objective. I find it liberating, really; I was not born burdened with a pre-ordained purpose, so I'm free to choose my own...