My plumhead was hand raised and it still took him some time to feel safe in his new surroundings.
When my plumhead was new, other than originally placing him in the cage, I never reached at him. I just let him do his own thing. I read to him, talked to him warmly and always let him know when I was walking by. I would open his cage and he would go to the top play gym on his own. I just let him do everything at his own pace. One day as I was reading a book to him he decided to come to me. I was sitting on a couch near his cage and I was reading outloud with my back turn to him. He hop/flew from his play stand to my shoulder and just looked at me. It was really hard to not get overly excited, but after sneaking a photo of this moment, I continued reading.
This method of just waiting worked for me. After that day things have only been going up. It did take several weeks before he made this choice. I did my best to just be interesting and non threatening. I also kept offering him treats which I am sure helped immensely!