We have two adults who took very little time to get acquainted with new owners. They were 6 and 7 respectively. The baby they had some years later was hand fed and nurtured by her owner (a very good friend of mine). At about 5 months I was introduced. He did step up to my hand but remained very rigid and statue like. When I came to see him a couple of months later, he wouldn't go near me. He was extremely paranoid and afraid of humans, except for his owner (now bonded). In time he was less afraid, but he wouldn't step up to my hand. I moved in with my friend, we became housemates, and so I would be seeing the "baby" every day. It took about 8 months later before he'd step up to my hand. And even after the first time, with a successful "time together" moment of about 10 minutes, later attempts would fail. He'd just stare at my hand and not step up.
This little guy is a talker. Pretty impressive vocabulary. And in the beginning I could actually talk with him if I wasn't standing near his cage. It took about a year before he'd be calm and collected enough to talk while I'm standing directly in front of his cage. Over a year after having moved in, he will now periodically step up to my hand when I reach into his cage. Compared to his owner, he is still a little "cautious" with me. But it's a night-and-day difference from a year ago! He does get easily spooked. You can't make sudden movements or loud noises near him or he freaks out.
What has also helped is that I periodically give him little treats like small banana chunks, sunflower seeds, and popcorn. He also gotten accustomed to me putting his food dish on the floor of his cage. He's so comfortable now, he will sometimes try to escape through the door. Earlier on, he'd stay still like a statue if I put a hand into his cage.
Another bonding step forward--I started making toys for him that are hung on the inside of the cage. He'll have fun with them, chewing and tearing them up... and then I'll put them back together and hang them up again. So, it took quite a while but these little steps forward built up confidence in him that I'm friendly and trustworthy. I still can't pet him when he's perched on me. His owner can cuddle with him, pressing her cheek on his back, kissing him, etc. No way could I do that with him at this point.
When your bird is staring at you and paying attention, talk. Ekkies are incredibly good with memory. They hear you. Your words will become familiar. And you may be surprised at some point to hear those words spoken back to you! It's especially important to do at a young age. When they get older, they tend to get set in their ways. The two adults we have simply don't talk any longer. Once in a great while, you might hear them mutter a word or two, but it's brief and rare. The juvenile? He's Mr. Chatterbox!