you have to address the attention problem as if left untreated you may find that your bird will start to pluck through boredom and for attention, this can be an incurable and fatal problem, i would add more toys to his cage, foot toys and or puzzles for your bird, dangle some nuts and bolts in their with the nut screwed onto the bolt this you will see your bird trying to undo which doesnt take long once they figure it

, you can buy puzzle toys for your birds online that will keep your bird amused, change his cage toys round regularly and let him ut more, buy him a playstation where he can come out and play with the toys,
keeping him cinfined in a cage when he is used to coming out would be asking for trouble as already mentioned they dont like change, cockatoos are very smart birds with a craving for attention that they like to be the center of , ...
try taking him out in a dog travel box , this will help push him back close to you as when put in with a load of strangers they always prefer the familiar face
cockatoos by nature are very destructive birds, buy wooden toys and also put some willow branches in their and fruit tree brances for him to chew,...
put your other birds in cages side by side so they learn to interact with each other, and have time for all of them, then when they are used to each others company try letting them out at the same time for a couple of mins then return back to the cage, do this regularly and for long periods of time until they learn to play with each other.....
add toilet roll tubes to the cage as they like to shred them, and to make them look more attractive dip them in food coloring, this is non toxic and the colors encourage play, ...
birds dont intentionally chew things in things you will miss and a bird is like a child even an adult bird is still like a small child and never grows out of the 3 year old phase, make your house to accomodate him, move curtains out of reach, move his cage away from walls and curtains, dont let him perch up high as this is seen as a dominance figure always make him perch lower than your head.. remove anything you dont want chewed and anything that is dangerous..remember your bird is and always will be like a 3 year old child!!
hope some of this helps you and hope you rekindle the joy you once shared with the bird...
birds in my oppinion are man and womans and childrens best friend, if you feel you cant rekindle what you once had and the bird still annoys you i think it would be best to maybe thinking about rehoming him to somebody who will find the joy you once shared with him
best of luck
katie
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