Looking at that shot the ambient light is the problem (there is a very bright light on the right which is lighting the trees in the middle of the shot). For good night sky shots you really want to avoid any clear light source (and get as far from the ambient light as you can), even the mon can be an issue and you will get better stars on a moonless night. If you want to get detail in the foreground you can expose for the sky and then illuminate the areas of foreground with a torch for part of the exposure (how long will depend on distance and the power of the torch). Hope that helps a bit.
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