A main component of the paradox is time, but this paper solve that. Life existed from the beginning, but only now has become complex enough.

So, we don't see or hear artificial signs in other galaxies because light is from the times when there was not complex life in the universe.

Now, we only have to solve why we don't see or hear artificial signs in our galaxy. But the problem is not so perplexing because we are talking about one or two million years.

If, for instance, a big part of the galaxy is bad for complex life (after all, we are far away from the center and that could be relevant), Fermi's paradox is solved.