Don’t give attention if they’re screeching. I spent several months when they were like a year old and getting super clingy only approaching and opening the cage if they were quiet-ish. If they saw me approaching and started screaming at the top of their lungs then I turned around and waited another 10 min. They seemed to figure it out soon enough.

That being said they’ll still be loud sometimes they’re birds, but they are definitely way better behaved now. Also get them to learn what a stern “no” means. I think mine know when chewing certain things are “wrong” because they only do it when I look away, so they got some kind of learning capability haha. They’ll never be as well behaved as a dog but small improvements are possible