The Hive barely had forty heroic cultivators in the entirety of their ranks.
There was a limit to how much support the Coral archipelago could give to the group exploring the new continent, its situation wasn't as stable as that of three big nations.
Defending its territory and trying to create footholds in the old continent was already requiring most of its assets, it couldn't just expose itself and risk to lose the stability that it had finally gained.
After all, even the Papral nation and Utra nation had been forced to ask for the help of the sects and noble families to preserve their richest territories while continuing the exploration of the new land, the Hive simply couldn't match them.
Also, colonizing the new continent was a real challenge: The atmosphere there prevented any human cultivator from inhabiting that land and the three big nations were extremely secretive about the methods that they were using for that task.