It seems like you could use some help with a better layout. If you want some help, I'd recommend taking a look at finished king of the hill maps. Viaduct is a popular example to follow, but feel free to also look at community made ones too. Some of my favorites are
Moonshine and
Coalplant.
Good koth layouts usually lead players towards the point, and offer a variety of ways to attack it. Use height advantage, flanks, and sniper spots as possible ways to attack.
I see your point is in a very enclosed and small place, you usually want some space so people have distance to attack it from.
Remember, you don't have to make a box and put things in it, get creative! Do some interesting things with your geometry. You can make slanted roofs, make stairs, or do whatever you really want to! You've made your central point out of a box, how about adding more buildings with lots of height or make building with an overhang? You can really go wild, time isn't an issue while mapping.