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I am owned by 4 macaws and a diva DYH Amazon. I'm a bird slave/zookeeper. What would you like to know? And good on you for taking him in!!!
Last year, I got a rehome 17 year old B&G, too. The 3 I "raised" are entitled brats. Yeah, I've made my bed. Petey, however, is grateful for the food and love he gets.
Be patient and let the bird dictate your interactions. That bird will definitely go through a mourning period. The best thing you can do is become a keen observer, a student of your bird. He will teach you what foods he likes, the toys he prefers, etc. Read, sing, and play music for your bird. Provide the best, undyed pellet you can, offer fresh foods in chunks and chop forms (Feathered Food Court on here), varied diameter and material perches, and figure out how the bird likes to bathe: New World birds are originally from parts of South America that average 6'+ of rainfall yearly. Your B&G will benefit from a good, weekly soaking, whether it's from a mister, in the shower, etc.