This might explain the Fermi paradox. If life isn't as common as we think it might be and say there are only a few other intelligent alien civilizations in the milky way then if they are a bit farther away like 70000 light years then what are the odds that they sent some sort of hello signal off into the universe which would take 70000 years at the speed of light to reach us and in the exact time it reached earth we had the technology to receive their signal. We have only had the capability to detect signals for not even 200 years.

Next think about what effort we have done to send a galactic hello. We don't have any deep space probes sent off in the universe constantly sending a hello message. So if all we did was fire a hello message away from earth for 24 hours what are the odds that some alien life picked it up verses they had that day off and missed our signal.

I think this is a much more plausible explanation to the Fermi paradox. If we want to do our part to prove it wrong we need to begin sending a universe hello from earth transmission and run it for not years, not decades, not centuries but from now and for the rest of humanity. Hopefully some other alien civilization has realized the same and they too begin sending a continuous transmission we might get lucky and pick up.