ALIEN CIVILIZATIONS from level 1 to level 7. We are ONLY at level 0 .72

Some have calculated that there may be as many as 40 billion planets that could sustain life in the Milky Way, our home galaxy.
There are also countless galaxies like the Milky Way within the universe.
Considering these massive, nearly infinite numbers, it seems impossible that there wouldn't be other intelligent life in the universe.
What's more, our civilization may not have been the first intelligent civilization in
the universe. Recently, the question has continued to shift more from "do aliens exist?" to "how can we find aliens?"