I've done the opposite from you... I have created a clingy monster who screams his head off literally throws tantrums if I leave the room. I completely solved the problem though by permanently attaching my tiel to my shoulder. I can only imagine that would NOT work if I had 21 birds heheLol, I actually live in a very small apartment and none of my birds are loud. They know they are safe and secure, and as long as meal time comes on time, everyone has enough toys, they are quiet. I have been very careful not to encourage any clingy behavior, and as my birds have each other, they are not alone when I leave the room. I get a chorus when I walk into the room, especially if breakfast is late, but other than that they are pretty quiet.
My daily routine takes about an hour to an hour and a half for feeding, watering, and cleaning, and I have multiple play stands. I make a lot of my own toys, feed fresh whenever possible, and highly favor full flight I feel like my sanity is pretty safe