I highly recommend Sally Blanchard's books and website. She's an expert in parrot behavior. There's also an online forum like this one, where you can get a lot of info and ask questions, too, which is really nice.
Her website is really "busy" and disorganized (in my opinion), but there is a lot of good info. I recommend clicking on the Site Map to find your way around. I really like the Companion Parrot Handbook, but I would try to find it on Amazon.com cheaper. There's a lot of good, easy to read information in it. She also has another book, called the Beak Book, which deals specifically with biting (I found that a lot of the biting info is in the Companion Parrot book, too).
https://companionparrotonline.com/
In my own experience, the most effective way to stop biting is to not give any sort of reaction to it. I know, easier said than done, but that's what's worked best with my little green cheek conure. I think this would be a lot harder with a bigger bird, but conures are fairly small. My GCC, Fiona, totally has my daughter buffaloed, but she quickly learned that she gets no reaction from me when she bites, so she rarely tries it anymore.
There is hope! It just takes patience.