It's typically interesting reading about speculation regarding the Fermi Paradox and/or Great Filters. I of course have no special knowledge, but my guess is that space is simply so large and empty that most civilizations turn inwards instead of outwards. There's a decent chance that while life is common, technologically advanced life isn't - life evolved almost as soon as conditions allowed (on a geological timescale) but it took a lot of good fortune and time for humans to appear.

There are an estimated 100-400 billion stars in our galaxy. If there are only a handful of advanced species at our level or greater then perhaps such civilizations reach out, hear nothing for millennia, potentially colonize a few nearby stars at slow speed on an interstellar scale, and then retreat into themselves via constructs like virtual universes. It could be that recreated universes indistinguishable from reality are more feasible than spending huge amounts of time in transit to the stars with planets that might be able to support your species. In that case you wouldn't be visiting Earth and it could explain the silence.