So far I've:
Lowered the upper level a bit to reduce the height difference, no more fall damage between the top and first levels.
Extended the sides of the second level so it actually looks like a stepped pyramidal structure
Blocked off the sightlines on the side with those containers (they look like they contain the parts for that tower structure)
Closed off the corners of the map near the spawn so snipers can't hang out there.
Placed a wooden ramp on each side as an alternate side route to the top.
Opened up the ramp there with an entry into the inside of the second level for... I don't know yet.
Most pressing issues:
Make the height difference from ground level to the first level less, or at least seem less.
Fix the sightline from spawn to the point without seeming too obvious that whatever I placed is there to do that.
Make the ramp thing on the right side of this shot less ugly.