The problem is not so much technology as simple physics.
It's just THAT HUGE a distance between even stars, let alone cavorting around the galaxy looking for places that might - with a few years of resource collection - provide you with a usable amount of energy to get to the next place.
And on the way, stop-offs are few, far-between, hard to make profitable and stopping, landing and then taking off again costs an awful lot of time, effort and energy that you have to take with you.
The chances are that if anything comes near, it'll only be interested in using us as a slingshot onto somewhere more interesting and what's to say our solar system is particular interesting to someone who's coursing their way across the galaxy by doing that - or even that our sun is worth riding past for those purposes at all.
It's not a question of technology really - if you have the technology, we hold no interest to you, if you don't, we won't see you any more than you'll see us. And the distances and forces involved and to be overcome are just so stupendous.
And then you work out that even if there are a billion stars in a galaxy, and a billion galaxies, the chances of someone bothering to wander past us, even if they are looking for us, is so infinitesimally small that it pales into insignificance.
And the biggest problem is really time. What if we're late developers, and everyone else has already been and gone? And quite how long would you need to explore a galaxy once you got the technology to hop around it, and are you still going to be strolling around in a billion years from now? Probably not. The chances of two such civilisations coinciding are small, the chances of them meeting are small, so it's not at all surprising.
More likely, our view of quite how unlikely it is is so underestimated because of our limited view of the universe that we just don't understand how optimistic we're being to even suggest the possibility.
Galaxy-hoppers would laugh at us from our one-planet, night-sky observations from which we're trying to extrapolate the entirety of existence for a universe.
That said, I firmly believe that there's other life out there somewhere. I just believe, even more strongly, that the maths says that the chances of us meeting it are so tiny that it's not worth worrying our "haha, just ONE planet? That's all you managed?" heads about it.