You can call Humanity many things, but unimportant is not one of them.
Just look at what we are capable of. We can build instruments to image individual atoms as well as look to the very edges of the universe. We've sent probes out beyond our solar system. By using our mental abilities, we can piece together the history of the universe back to the very beginning and look forward into the far future to know its ultimate fate. We can contemplate ourselves and how we came to be. IMO, that makes us uniquely important.