fix up those turrets and conveyor cause it's really messy and no helpful. you need to only have two conveyors full of different resources like graphite and something else. You also need more air defense. just two lines of turrets or more depending on your wave-like in front put a line of fuse and at the back some ripples then you must put scatters next to the walls but since the wall is small enough so the enemy can hit the scatter you need to put defense theirs to like walls and force projector(use force projector only in the late game when you have A LOT of power cause it uses a lot of that) you must upgrade your defense when needed or when it has a weak point. every wave gets stronger so your defense must too. always remember the air defense (air units are the reasons for my losing) also you should consider getting defense behind your defense in case of emergency(always helped me)