If you are aware of any other civilisations that know more about the fundamental laws of physics please provide proof that such civilisations exist.

I have twice stated that the expansion of the universe occurring faster than the speed of light is the only exception to the rule that nothing with mass can travel at or faster than the speed of light. Radio spectrum signals can travel at the speed of light. Otherwise
nothing with mass can travel at the speed of light.

Of course engineers, physicists etc will always be thinking of fast travel of all kinds. But as stated much earlier the fastest crewed craft ever built would need to travel 270 times faster than that in order to travel at slightly less than 1% of the speed of light. In the end the fundamental laws of physics are such that nothing with mass (except the expansion of the universe) can travel at or faster than the speed of light. Even if a craft could travel at the speed of light, in the great scheme of things we are going nowhere. At 1% of the speed of light (which is more than 270 times the best ever speed of a crewed craft) it would take 436.7 years to reach Alpha Centauri, which is only 4.367 light years away.

Let's pretend that travelling at the speed of light is possible. At that speed it would take our craft from Earth 50,000 years to reach the perimeter of the Milky Way Galaxy, which is one of at least 2,000 billion galaxies. We are certainly not travelling outside the Milky way. We are going nowhere and nobody is coming to visit us because we are certainly at least 1,000 light years away from any other civilisation, so with light taking at least 1,000 years to get there they would detect Earth as it was at least 1,000 years ago, having nothing in the radio spectrum leaking out and no obvious altering of natural gases. So at that time Earth was not occupied by a technological civilisation and thus it would now be ignored by a civilisation trying to detect proxies of intelligent technological life.