the answer to Fermi's paradox is that technological civilizations end up hidden and imprisoned by their orbiting space junk.
Fermi's paradox is based on a linear view of technological development, projecting current technology into the future in roughly a straight line. It doesn't work because technology does not develop in a linear way, just look at the development of the mobile phone. First, they were the size of a typewriter and powered by a car battery, then they got smaller and smaller and tiny and... then freaking enormous with a built-in PC. Now they convert to VR goggles, GPS navigator, Camera... etc. Clarks three laws state...
1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
3. Any sufficiently advanced technology is indistinguishable from magic.
But there is a fourth law he should have included.
4. Any sufficiently advanced technology is indistinguishable from nature.
The goals of any technological civilisation should necessarily be greater complexity leading to a technology more complex than naturally evolved organic life. And improved energy efficiency surpassing the efficiency of naturally evolved organisms. If you want an example from science fiction of what an advanced civilisation would look like after a million years of development, the planet Pandora from Avatar. A planet wide fibre optic neural network utilising bio-luminescence, people and animals with built in USB ports. The ability of the natives to upload their consciousness to the living network when near death. And a mineral with ridiculously useful properties that don't occur in nature and exists on only one known planet.
Space junk is not as big a problem as you might think. a few thousand solar powered drones would solve the problem in a few years. You just need a refuelling ship parked in orbit to refuel the drones after each mission slowly working its way around the earth. You could even recycle the space junk to supply orbiting space stations with construction material. Every problem has a million plus solutions, and one or two hundred that may work and a few that are practical and three or four that will be tried and one or two that will become the standard.