He's beautiful. You've already accomplished a few steps. Time & patience. One thing macaws love is sharing meals. Have him sit at the table with you. Give him a bowl of food while you eat yours. He can have some human foods too. Mashed sweet potatoes are a good food as they provide Vitamin A. What ever veggies you can get him to eat. My B&G is picky, but she loves sweet potatoes. A small sweet potato washed, with a few holes poked in it, put it in the microwave for 2 minutes, turn over & do another 2 minutes. It should be fork done by then. Slice it open it with a sharp knife, let it cool & then scrape it out & mash it with a fork.
In-shell nuts like walnuts, almonds, pecans are good & they help to wear down the beak.
If you don't have a swing in his cage get him one. Macaws love to swing. All 3 of my parrots have a swing as their high perch. They sleep on them & spend a lot of time on their swings.
Did you tell him he is now home? If not do so. Also keep explaining things to him. He'll pick up on it pretty quick. They are so smart. My girls know when I say Mom needs a nap it's quiet time & they go quiet.
For his travel crate. Make it a fun place. Let's go for a ride & then take him for a short ride, give him a treat, etc. Try to get him in it without using a towel. My B&G will climb off her cage & right into the travel crate. Getting her out is another story, as she loves the darn crate. She knows it's for going for a ride or to the aviary. Last time was to the vet & she jabbered the whole way there.
Don't forget they like silly, dance, sing, etc.
He'll learn to trust you in time.