Hermes, my opinion is that it is rather self-aggrandizing to pretend that there is a cosmic meaning to our individual lives.
And “humanity” most certainly is part of the Stoic outlook, in the form of cosmopolitanism. Extinction isn’t moral or immoral, it’s a fact of life, like individual death. What is immoral is to cause extinction for personal gain, because it imposes suffering on other beings for selfish reasons.
And I think the notion that the universe makes “progress” toward complexity and intelligence is a fallacy resulting from imposing our own point of view and priorities on the cosmos at large. Another example of self-aggrandizement.