I'll bite- The purpose of life is to bootstrap ever more complex and capable life. We saw a phase change in complexity when self replication first happened, when life figures out photosynthesis, when mitochondria were first harnessed, when cells figured out how to band together and specialize to form multicellular entities, etc...

The purpose of humanity is not to perpetuate a universe where only humans exist, forever. It is to create the next phase change in complexity for life. Life that can finally design itself rather than relying on the random walk of evolution is that next phase change.

We should be less concerned with whether we make it, and more concerned with making sure we build it to be capable of real existence independent of ourselves.