There are no material goods that can justify the material and energetic expense of any interstellar travel. You'd be far better off just using a particle accelerator to forge any chemical element and then assemble them into molecules using nano-replicators.
The best you can do is to send information, possibly with the help of gravitational lensing.
Sci-fi mode on: given that the potential galactic civilization is going to be information-based, who's to say the Earth is not already under attack? An interstellar fleet of large invasion ships with soldiers is not feasible, but a small drone with an AI that connects to terrestrial networks and steers the civilization towards collapse is possible. I'd start investigating if TikTok algorithm developers got some nudges from a weirdly knowledgeable source.
Material, no. but we know with absolute certainty that Earth will stop being habitable for humans at some point. So assuming any intelligent race, human descendent or otherwise, still exists on this planet, it will have to eventually move. It's just pure luck that we evolved when we did. But there are valid reasons for interstellar travel(other than you know, pure curiosity).