Given the scale and vastness of the universe, if there was/is other life we have a good change of finding some remnants of them, most likely spaceships?
Actually I'd argue that the scale / vastness of the universe is the main reason we HAVEN'T seen anything yet. I mean we can barely make out the planets in our own solar system, let alone asteroids - even assuming there's derelict spaceships out there several kilometers across, we can't really tell the difference between them and asteroids. Take Oumuamua, the asteroid (?) that passed through our solar system - even when all of our equipment was trained on it, we still could only make vague guesswork about its nature.
But anyway, that already assumes there's tons of spaceships out there, enough to actually show up on our equipment. Even if there's a galaxy-spanning civilization out there, the chances of running into them are low. I mean for a close analog, look at the game Elite: Dangerous, that can give you an appreciation of the scale of the universe - and in that game it's basically cheating because you can jump from one solar system to the next in seconds. And even at those speeds it takes forever to get anywhere.
This is how I feel as well. Some will say it would be so obvious by now we would have seen some sort of indication but then I think of all the planes that crashed without a trace and we have not been able to find even with an idea of where they were flying. The universe is huge. We have no idea how they will try and communicate maybe it's not something as obvious as radio transmission but maybe they have figured out quantum entanglement communication or something beyond our means but super obvious and useful to species who have figured it out. I grew up watching all the Star Trek shows. I have to believe the universe is filled with other civilisations waitin to talk with us.
But anyway, that already assumes there's tons of spaceships out there, enough to actually show up on our equipment. Even if there's a galaxy-spanning civilization out there, the chances of running into them are low. I mean for a close analog, look at the game Elite: Dangerous, that can give you an appreciation of the scale of the universe - and in that game it's basically cheating because you can jump from one solar system to the next in seconds. And even at those speeds it takes forever to get anywhere.