After the High Evolutionary died, the Guardians of the Galaxy did not leave Earth, in order to repay the Avengers for their help these past few times. They prepared to help Earth fight Darkseid. Even if their strength was not especially great, every little bit helped; at the very least, with their abilities, dealing with some Parademons would absolutely be no problem!
As for Robet, he once again used Instant Transmission to appear inside the spaceship where Supergiant was. The spaceship continued flying in Thanos's direction. At this point, Supergiant still had not woken up—or rather, given Supergiant's current condition, unless Robet took action to treat him, he most likely would not wake up at all.
And so, the interstellar voyage continued. Thanos's spaceship had not stayed where it was just because Supergiant and Thor had wanted to return. They still followed their original plan, searching for other cosmic wonders to increase their strength.
During the interstellar voyage, Robet also contacted the Nova Empire. As the only powerful imperial civilization in the universe that had continued to exist after crossing paths with Robet, the Nova Empire was indeed the perfect choice if Robet wanted to obtain more intelligence on the various civilizations of the universe.
After all, the Guardians of the Galaxy really could not get their hands on any secret intelligence or files about the universe. When it came to data and records, there was still a huge gap between individuals—or small teams—and cosmic civilizations.
Unfortunately, when Robet contacted the Nova Empire, he was unable to find any information on Darkseid. There was plenty of information on Apokolips, but the problem was that there were countless planets in the universe called Apokolips, and Robet had no idea which one was the real Apokolips.
Just like how Thanos's Titan was