Can you explain what you mean with "clarity"?
If you refer to the brightness of the image then you can do that in any image processing software like Preview (macOS), Photoshop (macOS, Linux, Windows) or Gimp (macOS, Linux, Windows).
If you refer to the sharpness then you first need to make sure that the Seestar is focused well. The auto-focus function of the Seestar doesn't do a bad job so make sure to use that first. If you then take an image, you can sharpen it in the software that I mentioned earlier.
Another option is to take a RAW video of 1 to 10 minutes and then to use AutoStakkert!4 to stack the images. Once done you'll need to sharpen those as well. Note that AutoStakkert!4 is a Windows application but Linux or macOS users (like myself) can run it in Wine or in a Windows VM. I do the latter.
FWIW Seestar chooses an exposure time for the Moon based on the Moon's brightness. Longer exposure times will lead to both overexposure and blur. The latter is caused by the Earth's atmosphere. So you really want to stick to the exosure times chosen by Seestar. They are in the order of 10 milliseconds.
HTH, Wouter
