The Chaos Star Realm has an entrance into the Xavier Ancient Ruins. The region you entered was also the Night Demon City region.
Lu Ze and the girls could enter the Xavier Ancient Ruins and go from the Night Demon City to Blood Stone City region and then leave the ruins from there.
That would be closer.
However, since they killed a few Blood Stone City bosses, they decided to be careful and avoid entering the ruins.
With a star map, they knew the way at least.
The Chaos Star Realm was also in the Eternal Song Gallery.
The star map wasn't hard to find. Sabrina had one.
It would take five months to fly back with the Elf Race ship.
Time was no matter for Lu Ze and the girls.
They could use these five months to cultivate.
By the time they got back, they would be about to break through to the cosmic realm state.
Thus, they went to the space station, took out their ships, and soared into space.