Long post! Any advice??

I'm extremely tired!!!!! We have a 10 month old goldendoodle. He has been such a sweet baby. He had the usual puppy traits of biting and chewing but nothing we couldn't handle. With training he was good on walks and wouldn't pull too much. It's been a couple of weeks and he is absolutely a menace on the walks. Pulling so hard that the harness breaks. He'll suddenly look at the leash and start biting on it pulling it and biting my hands really bad that I feel it in my bones. It's really hard to hold onto the leash when he bites so hard. I try to drop the leash and stand on it so he doesn't run away but it's so difficult because he is strong. Today he was biting on the leash and my hand and pulled it so hard the harness broke. I tried to grab his collar but he slid out of it. It was terrifying because he just took off, it was raining a lot and I had no way of catching him. Another dog and his owner were coming out and he lost it. He ran towards them I think it was to play with him but ofcourse he had so much energy that it maybe have come off as aggressive idk (we will go apologise to them) But they were terrified and angry, understandably so. After a while I managed to get him into our garage. I started bawling after.

Idk what to do but ive tried so much, putting a front clip harness. Treats when we walk. Training at home. We try to get as much mental enrichment as possible and also playtime but nothing seems enough his energy just never wears off. He chewed up out entire couch and I can't even get started on the humping and biting. We tried crate training at first but gave up eventually I think maybe we should have stuck to it. He will be neutered in a month but I'm scared that will onset more behavioral challenges. Idk is this normal what are we missing??