Oh, I do sympathise, I have had two destroyer dogs.
I got my last dog Penny, a GSD, when she was six months old and because I was out at work I had to leave her all alone for quite long periods and she destroyed everything, carpets, curtains, chairs, doors and even took chunks out of a wall! And she howled. Crates and Kongs were unheard of then, at least in my neck of the woods. Her chewing lessened as she got older and I got a shorter hours job, which made her happier and then I retired from work a short while later which made her happier still!
With Bob I made sure I was prepared before he came through the door, big crate, the works, and I was home all day just like I was with my other dogs so surely there wouldn`t be a problem. Ha! He not only chewed everything he ate it as well! Even when I took him out on the lead, stuff would be down his throat so fast! No wonder my hair is nearly all white! One time he even chewed a hole in my duvet while I was sleeping, I woke to feathers all over the place. Anyway, the good news is that he is a lot, lot, better now, (I don`t know if you read the thread about his bed) and I find I can trust him a lot more, I even left a big Panther stuffie, big as him nearly, hanging around and he hasn`t touched it...yet!
I am sure Nebo, like Bob, will get better as he gets older, though hopefully long before he gets to 4 years old!