There is no meaning to life, there is no purpose to existence. One just does. It is up to the individual to provide "meaning" such as it can be found.
Ultimately in a couple million years even the memory of humanity and all we came up with and "know" will be null and void and lost to the aether.
If there is a great "filter" and we are alone in the universe once we're gone all of this is gone too. All this thinking, doing, being...all just gone.
It's kinda sobering to think how meaningless it all is. Except it isn't really. We have the time we are here to do with what we want to do. That should be enough. Even just to live on in the memories of others, but it's not enough for most people.
Like the Cure says:
"It doesn't mean there has to be a way of things
No special sense that hidden hands are pulling strings
But living on in others, in memories and dreams
Is not enough
And it never is
You always want so much more than this"