I suppose there are probably two main options. Either our existence has some purpose or it’s a random, unintentional by-product of the universe and has no purpose at all. I can’t claim to know the answer, but I choose to think there is some sort of purpose or intent for why we exist. Maybe I’m wrong and everything we do and all my thinking about purpose is just a waste of time, but if it turns out that’s the case, then who cares, it was all pointless anyway.
So I choose to believe there is some value to our existence. I don’t know for certain what it is, but I’ll explore that a bit more on this site. Maybe it’s not divine. Maybe it’s not all that grandiose. Maybe it’s not really about “us”, but what we as a collection of life on Earth become. Maybe humans are just a stepping stone along the journey to the ultimate purpose like the single celled organisms that evolved into what we are today.