Not enough trees and shrubs, and the trees-choices and arrangements are a mismatch. Right now it looks like a bald head. Please employ a landscapist from Japan or California . Because real experts know what they’re doing, and they follow up with maintenance etc. otherwise you’re saving money at the wrong end. Most of all, did you use an automatic watering system? Cambodia is so hot just like California, Good Luck.🍀🌝