Here's what I would try (to begin with):
If you have it on AUTO, which I think you have, try MANUAL.
4000 or 1080 @ 25-30fps should be great for these shots. Choose a setting (ISO) and corresponding shutter speed that suits your application. Fiddle with the histogram until you have an average with the 'mountains' in the histogram just to the left of the right most lower corner. (let super bright white things (lights) be as overexposed as they are supposed to be, don't compensate for those or your whole video will be underexposed). Try to keep the shutter in the 1/30 - 1/15 range. If you need to set the ISO very high, you know you will get a grainy picture. In that case lower the shutter speed so that the graininess is gone entirely (or at acceptable level given the circumstances). You will get some motion blur then, especially while shooting very bright objects (can be cool though). But it comes all down to make the right compromise while shooting. Deal with the rest in postprocessing. Have the software for that.....There are enough threads about that if you need info.
Beautiful spot BTW. Try different settings, shutter speeds, ISOs, and see what happens. Low light filming is a specialty. AUTO setting is normally not the way to go in these conditions.
After that you can start to experiment with LOG settings and use LUTs (processing templates) in postprocessing. Again, search the forum or youtube for info on that. Some great info on the DJI Inspire1 forum as well.