The Paradox is really not so much that we cant find them, its why they havent found us.
Assuming we get the technology to travel at 1% or something like that the speed of light over long distances, which in a couple hundred years we might be very likely able to, we can start colonizing the Milky Way and it would take us some million years, but eventually we could reach everywhere.
So if WE can do it, why isnt there some other advanced civilization thats ten or more million years older and more advanced than us that is already doing it and has reached us ?
The resolution of the Fermi paradox could be very easy though. The Youtuber and Astrophysicist Dr. Becky has recently made an estimate that thanks to the many factors one needs to have intelligent life on a planet there are only about 10,000 of them in the visible universe.
Since the universe is mighty big, thats only one such planet every 10 million galaxies.
Of course theres a lot of assumptions behind this guess, but the bottom line is that we found a lot of special conditions for our system that allowed life to happen, multicelluar life to happen, and intelligent life didnt happen for many hundred million years, that in the sum its very unlikely to happen.