There is a huge difference between life and advanced civilization. For most of its existence, Earth had life but not intelligent life. Telescopes only recently

There is a huge difference between life and advanced civilization. For most of its existence, Earth had life but not intelligent life. Telescopes only recently have been able to detect signatures of life relatively close to Earth. There have been very recent possible discoveries. But may not be able to confirm without going there. There is no systematic search for radio waves. We would only be able to hear anyone for short distance. Advanced civilizations would be rare so not hearing doesn’t say anything about life. The one thing we haven’t seen are megastructures like Dyson Spheres. Those would be visible for long distances and we haven’t seen any in our galaxy.