The Fermi Paradox is not actually a paradox nor was it Enrico Fermi's original idea.

The Fermi Paradox is the conflict between the lack of clear, obvious evidence for extra-terrestrial life and various high estimates for the existence of such life.

There are various answers :-
There is no such life.
There may have been such life, terminated by plague, high-tech war, asteroid impact, climate change etc.
There is life but it wishes to not be detected and can implement such a wish.
There is life but it will always be too far away for it to detect us or us to detect it no matter how advanced the technology.