With the vast distances and inherent extremely low density of the cosmos, I'm not optimistic about such a message making it to, much less being understood by, another sentient species.
In order to have an environment that can nurture life, you need an rocky planet in the goldilocks zone, with liquid water, a still hot and liquid iron-nickel core below the rocky surface to ward off cosmic radiation and solar flairs and their destruction of life, a stable medium sized sun, with a larger than usual moon for tides, a balanced composition atmosphere that doesn't dive off into greenhouse gas hell, such as Venus, and a number of millions of years of relative environmental stability.
That's one hell of a lot of low probability conditions required for life, much less the development of advanced life. I'm rather dubious that its likely to actually exist, but that being said, the universe is extremely large, so we'd not know as of right now.
Recent research indicates the conditions for life may be more flexible than once supposed, and that planets with such conditions may not be as improbable as some speculations have indicated. But we don't know, for sure, and won't until we can see those little specks much more clearly... in just a few more years with the new TESS and Webb telescopes we may have a much better idea.
But that's "life in general", including simple microbes standing alone. An ETC (extra-terrestrial civilization) is a much more uncertain prospect. For that you probably require advanced life, and big brains, and even then there's something more. Lots of terrestrial animals have big brains, but still don't exhibit evidence of H.Sap. level intelligence.
To be a technological, communicative ETC they'd need advanced communication (such as language), data storage (ie writing), the ability to readily manipulate their environment (opposable thumbs, etc), strong curiosity or equivalent (to explore, experiment, and build new things), to develop to the level of technology that would allow them to communicate with us, or otherwise do things we could detect going on in our stellar neighborhood.
Then, setting "FTL" aside for the moment, they'd need to survive as an advanced civilization long enough for us to detect their signals, or vice-versa. And the signals would need to be strong: people often talk about how we've been sending out RF for over 100 years, but scientists have said we probably couldn't detect equivalent-strength signals coming from Alpha Centauri with our current in-use radio telescopes (too weak).
Sublight probes like Breaththrough Starshot or the Orion Project probably wouldn't be used except for relatively short range missions of less than 50 LY.
People sometimes say "Well SETI has been looking for ET for sixty years with not a peep", but in fact SETI has only been looking at a relatively limited number of stars, and only on an off-and-on basis as they can get telescope time... we could literally have been bombarded with hundreds of ETC radio messages in the past 60 years and missed them all because we weren't looking at that moment, or were not looking in the right direction, or were not listening to the right frequencies.
Space is big. Not just in distance, but also in time scales.
We haven't seen any definite evidence of Kardashev II or III civilizations in the known universe... but again, the time scales involved make it dubious that we would, in the limited time we've been looking. Some ETC could have started dismantling the core of our galaxy for building materials yesterday, and we might not see it for another 20,000 years.
But leveling those time scales for the moment, the three most likely explanations for the seeming silence are:
1. Space is just too big, and we haven't been looking long enough or hard enough.
2. We're alone in the galaxy, and possibly the universe, as a technological civilization.
3. We're among the first technological civilizations to develop, or possibly THE first. (First past the "Great Filter" anyway, if there is one.) Any other ETC's that may currently exist are too far away for us to have detected yet.
It's a complicated line of conjecture, but we're accumulating more data every day. I will be intrigued to see what we find over the next decade or two as our ability to look more closely develops.
