All very nice, but how about this? We are not all that interesting, nor special, and in the last 35,000 years when we could comprehend what we're looking at, no-one's bothered to swing by and ask for a cup of sugar.
It's worth noting that life has been on Earth many thousands of times longer than Humans have been.
Looking just at our own planets history and turning the question around - why haven't any one of the 99.999% of species that have already existed on Earth and died off before humanity showed up risen to our level of technology and space travel?
There should be a few billion species in space already by that logic, as all of them but a very very small percentage have been around Earth much longer than we have.
Yet that doesn't appear to be the case, as most of those billions of species are now extinct, and there is "only" a few millions currently living, and so far only one utilizing technology.
There's also the question of why any civilization at such a high level would care to communicate with humanity.
After all, do you actively seek out all the ant hives around your property and make them aware of your presence let alone try to communicate with them?
No, you would deal with the rare one that becomes known to you, and continue to ignore the hundreds of others you don't know about.
"Dealing with" might be to ignore the hive if way off say at the edge of your property line where you don't care, or perhaps simply destroying it if say it was very near your home.
In the latter case, destruction would be so swift and near total that both the hive in question wouldn't have more than a few seconds to even be aware of whats happening before being killed, and generally so total that communication of that fact to other hives should be impossible.
Even our one sample set (aka humans) don't look too very far outside of our own scale.
It has been what, a hundred or so years since we even learned about things the size of bacteria and virii, let alone smaller at the atomic scale.
It's been roughly the same amount of time (less I believe) we have had the technology needed to discover the largest structures in space exceeding "solar system" size.
And while I admit we have come quite far in those hundred or so years, most human minds still seem to out-right reject the concept of a system operating as a whole on galactic scales as even a possibility, let alone a requirement for such a civilization.
It can be argued how much more difference there would be between humans and ants, and humans and a civilization capable of interstellar colonization - but no matter if that is 1:1 or 1:[some-large-factor] - it is a bit hard to imagine that improving the nature of the situation in our favor.
Finding a world capable of supporting life alone isn't (or shouldn't be) the only factor.
We need to find a world capable of supporting life, and already having a few billion species that have arisen and potentially fallen before there are any odds of a technological civilization being above zero percent.
As others have said, we are barely just now at the point of detecting planets where this is even a possibility, but we have no ability to tell if life has arisen and falling the few billions of times that would be required to raise the possibility above zero.
Likewise, if such a galactic system was operating with individual components the size of galaxies or solar systems was functioning right in front of our eyes, would we recognize it? Would it even be operating on a time scale we could have perceived any changes occurring yet?
Think a fruit fly, which only lives a week or so, trying to contemplate the life time of a human at 80ish years, or a human civilization at thousands of years... That scale is likely closer than the difference between us and something operating on a time scale of millions to billions of years.
Such a civilization could be right in front of our nose right now, and we have only observed such a tiny percentage of the whole of any one action that no obvious patterns are even there yet let alone detectable.
Sometimes it's hard to wrap our minds around the scales involved, both physical and temporal, and this all assumes we mostly know the general idea of what is going on with physics of the universe, which while likely (at least on a gross level) is still far from certain.