We’re working with an n of 1 basically. If you’re talking about the drake equation, many of those terms are wild estimates that we simply don’t know the answer to. In the course of astronomy history when we’ve assume uniqueness about earth or our cosmic situation we’ve generally been wrong. Unfortunately the vast distances between stars make an estimation of life in the universe difficult with current technology.

But there’s septillions of star systems in the galaxy with billions of years for life to happen. Intelligent life has happened at least once because we’re here. It would be utterly shocking if we were the only intelligent life out there.