If it's true that there is little to no evidence that any technologically-developed life has visited our planet, could it be that no civilization in our galaxy has developed interstellar travel?
If there is a race, a civilization that has, maybe they’re just on the other side of our galaxy or just too far. Our galaxy is a vast place (though insignificant compared to the vastness of the universe) and our solar system is merely a a pin prick that I would imagine would be easy to miss and pass over.