Interstellaria/Brand

If you haven't gone to Trade Co HQ yet, do so. You need to ask around for your next objective. First, if you haven't upgraded you weapons yet, get some artillery or rockets from Yunqi or Eshk. The UHC is now trying to kill you in earnest, and they will have artillery.

Trade Co HQ
Talk to the Human in the right side of the landing bay. Pump her for information until you get the Horizon Report. Then go to Brand.