The lunar surface was made the way it is by impacts. The only artificial things there were put there by humans in the past 60 years. That makes sense, since ETs would have little reason to build there and not here.
Then you have never seen and analyzed any videos taken by various Apollo missions of the surface, evidently.
There are lots of reasons to build on the moon. Prove who built the mega structures on Earth.
You are talking alien, I’m talking forgotten Earth civilizations.
Here’s a few of many that seem pretty straight forward with explained methodologies:
MOON - LEANING TOWER - Apollo 10
https://www.youtube.com/watch?v=edOOPxbNeZc
MOON FACTORY Transformer Structure in Apollo 8 Image ArtAlienTV
https://www.youtube.com/watch?v=n-pk6lSx34k