Well the other groups you refer to didn't survive the late bronze age collapse. Which makes answering your question a little difficult since we don't really understand what caused the late bronze age collapse which in turn makes it hard to explain why it didn't happen to Assyria.

One possible reason that Assyria survived the bronze age collapse was that if it was caused by the development of tactics and weapons that caused decline in effectiveness of war charriots (one theory) then since Assyria controlled an area that included terrian unsuitable for such warfare it's armed forces were already well adapted to deal with the new tactics and weapons. The problem with this theory is it doesn't really explain what happened with Mycenaean Greece.

Beyond that your question falls into a matter of defining what counts as still around. What about Egyptians or at least copts? The Han Chinese?

Then you have the issue that, while most of the greek cities got pretty badly hammered by the late bronze age collapse, Athens has never entirely been depopulated so does that count as still around even though the modern population would generaly identify as greek rather than Athenian or Mycenaean?