Welcome to the forums!! We have two cockatoos, bare eyed toos, smaller then your boy. You've gotten some great advice that really does work, just takes time for Fireball to learn the new routines
Toos love to tear things apart, and you can do quite a bit of make your own. Save up the paper pulp type egg cartons (long as no egg goo on them from a broken egg), toilet paper and paper towel rolls are great items you have around that can make fun toys. My Ivory loves q-tips, strangest thing, but one of her favorites. I take a plastic wiffle ball and stuff in shredded paper then push qtips in for Ivory to pull out. Also children safe puzzles are another great item to use in making foraging and shredding toys. We use gimp or natural hemp twine, punch a hole in the large puzzle pieces and use them as ends for toilet paper rolls. We stuff the rolls with shredded paper and nuts or treats, then tie the puzzle pieces to cap the ends. Ivory loves gimp (plastic lacing like the kids use for making string bead crafts), and first thing she'll do is snip the gimp, then pull everything apart. A roll of paper for a desktop calculator is another great item that many birds will just pull and rip up.
I could babble on, but check out the toy section, there are tons of great ideas there too. Curly straws are super easy to make too. We use those in conjunction with cardboard type shredding items and they are usually a hit.
For the screaming, we found that they quickly pick up another type of call. Everytime I talk to or ask her to step up, I do a tongue clicking or kinda kissing sound to Ivory, she learned almost instantly that was a sound meant she was getting attention. She seldom every screams or calls, but will do the clicking and when she says hello, we all answer her, so that's another noise she knows to make to get attention or a response. The only time we ever hear a too call or scream is when she thinks she has been left alone and gets startled such as by one of the cats or when we are all out and she hears the key in the door, she will call then start with her hello.
Post some pics when you get a chance, we all love photos of everyone's babies. Congrats on adding Fireball to the family and again, welcome to the forum!!