Try topaz DeNoise AI is awesome to eliminate it and is a 30 day free trial.Am exploring the photo stacking option...
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Create Noise-Free Images Using Exposure Stacking
Current cameras' sensors are getting better year after year. Unfortunately, they cannot create noise-free images at high ISO just yet. I am sure the day will come soon, but in the meantime, there is a very simple technique using Adobe Photoshop or Affinity Photo to create the illusion of a clean...fstoppers.com
Burst mode on Anafi is JPG only though, not sure if RAW will make a difference.
Cheers.