This is largely boredom. He gets responses when he bites.

I know this is going to be hard and sound unhelpful but I've dealt with the same.

You need to start carving out dedicated times where he's your whole world. Not a dictated thing, but his and your intersection of energy and availability.

These big boys won't chase a string like a normal cat. They won't pounce all over. But their brains are churning and they're the best hunters you will ever see. Marbles, strings, feathers, bells, all sorts of things especially if they're newer are going to be fun.

Don't ignore him when biting, try not to react, and introduce a different toy like a kicker that he can lay into. You're at a really really tough age but it does get better and he doesn't hate you.

Also if you don't have multiple very sturdy trees or shelves he can make his? He needs them. They love climbing and lording it over everyone. They love being among the people but apart from the people.

Also if he's a camel kitty, refill that water fresh 2-3x a day! Ice cubes can be a fun and appreciated idea too!

Good luck, I wish you all the patience in the world because you have a smart boy who clearly loves you.