Greetings, I am Dr. Pat. I have worked with birds exclusively for many years.
I think that you have plenty to work with here, Jake is certainly not a lost cause.
First, you will have to find out what in your behavior upsets him so. In his mind he is 100% justified in punishing you. They are complicated beings and have had 65 million years to evolve very complex and beyond-human-like psychology and emotional development. It is not easy and not fun (and maybe not so fun learning about yourself--I speak from experience) but is ultimately rewarding is a deeply meaningful way. And at worst, like some human relationships, at some point you may have to part ways. BUT don't give up yet. This is not a one-question internet fix--so be prepared.
I highly recommend a behavior counselor. It really works and can work very fast in most cases. seek behavioral counseling IN PERSON, family members and bird. There are some very serious issues developing here, and your or the family reactions are inappropriate. This is not an easy set of problems to correct, and the humans are mainly at fault and therefore the ones most in need of behavior modification. I always have the entire family plus bird come in for at least an hour-long consult; it is much easier to do in person and evaluate everyone's non-verbal relationships. So online I can only give general suggestions and urge that you seek proper consult at home. There are a number of people who do this, but you may have to call around and check with a number of avian-experienced vets to find a reputable behavior person.
great resource link, with a LOT of behavior information:
an excellent source:
Online you can check to see if this https://companionparrotonline.com/beak_book_detail.html is available; it has some practical solutions to common behavioral problems. There are a number of "Idiots Guide to..." books and the parrot or cockatiels do have some good insights.
There have been a lot of positive reports about target training, and it is easy and fun to teach your macaw the basics. It helps give your bird some purpose in life and redirects the high-octane energy and demands.I urge again that you have hands-on teaching sessions, anything on behavior over the internet is not going to be as successful. Most avian vets have references for your local area.
He is in the height of puberty/hormonal activity, similar to a human of equal age. So this makes him moody and confused and angry and frustrated. Of course this gains bad attention, so the cycle worsens. Like humans, they can get through this stage of life IF the bad behaviors are not exacerbated or misunderstood. And the appropriate responses are given. He doesn't know whether he is offspring, mate, or rival. Parrots are flock animals and are NEVER alone in the wild, and their friends, siblings, parents and other adults do not tolerate bad behavior. In a loving human family, he does not have that variety of input. He no longer trusts his people and is acting out. He is partly a bratty teenager and partly lovesick. And you are not acting like a normal macaw.
He needs to learn to entertain himself and to have more self-esteem. That means you are going to have to give him even more attention, but in a different way than in the past.
First the bird needs to have a complete check up and health screen. There may actually be a real physical reason for biting.
Then strict 12-14 hours DARK QUIET UNINTERRUPTED SLEEP AT NIGHT. Sleep deprivation leads to bad behavior, anxiety and physical problems.
The bird needs proper diet. See below for guidelines. Junk food can contribute to hormonal flux and depression and aggression.
He needs something to do with his mind. You can read children's books to him, point out the pictures, show him garden catalogs, teach him to count, anything to make him educated. He needs to learn to play by himself with the assurance that he has not been left out or left behind.
I cannot stress enough how important it is to train yourself first and see the world through his eyes. Militaries are really good birds, and he can be one again.