Space is really, really, really big. There could be a trillion intelligent species of our level of development broadcasting in English on radio channels we use and we wouldn’t hear them because space-time is big.

We’ve been listening for radio signals for what, 70 years? Do a bit of math. Also calculate how strong a radio signal would need to be to reach us from 70 light years away.

Now look up how big the galaxy is. Now look up how many galaxies there are and how far away they are.