Did you install the plants or a landscaper? If a landscaper, what did they recommend?
I recommend hand watering new plants at least two weeks. That way you know it’s getting deep watering and you get to know the plants better. You’re now two months in. Did you hand water them first?
What are the specs on your drip irrigation line?
Are the trees and shrubs on separate zones?
Are your plants native to the area?
What @eunchan said about root depth is important.
Welcome to the neighborhood!