You haven't gone wrong. You'll never get detail in the moon while maintaining detail in the foreground. The contrast is too high for the camera to record both. It's one or the other I'm afraid.
The problem you are experiencing is the moon is actually really bright.
It is, essentially, a large sunlit object in the night sky. So you need to expose it like it is lit by the sun, which would the render anything else at night extremely under exposed.
Also, I notice a little flare in your shot, this is often caused by having a filter on the lens when it isn't necessary.
Hiya been out tonite doing some light trails and had the same problem myself moon was so bright it looked like a shining star on the finished product.
Would some sort of filter not help it?
I'm not after a detailed moon but less glear would be good
Or take a separate shot of the moon correctly exposed and composite it in with PS. It will look very fake though.
No camera can cope with a contrast range of 13 stops. If you've seen images of a moonlit landscape with a perfectly exposed moon in the sky, they're fake.. sorry.
You could use a DFN filter on a shot of the moon in daylight.
Or a Neutral density gradient may reduce the dynamic range a bit.
Also, I notice a little flare in your shot, this is often caused by having a filter on the lens when it isn't necessary.