Hello and welcome! You have made progress already and that's great.
It seems it's just real easy for birrds to become spooked if hands. Hands seem like predators to birds. Sometimes they struggle to understand that hands are part of us. Especially if someone grabbed them a lot. It even happened to me and my green cheeck conure after we had a loving relationship for five years. I had to earn back her trust by feeding a lot of treats by hand, paying attention to her body language and mood. By moving calmly and with lots of praise.
Safflower seeds make a great treat. If your bird will take treats by hand that's a great start. If not you use a small treat dish and you out one treat in the dish and give space to the bird , when it takes the treat say the same phrase everytime like good birdie. And work up to taking them by hand.
For step up training you can use a hand held perch and let the bird step up far from the hand at the end if the stick. Give praise and treat. Over time , and the amount of time depends on how it's going. You give a little less room at the end if the perch to step up, and you praise and give a treat. Every day the bird does this easily and calmly you give less room at the end if the perch and your hand us getting closer to the bird. Until finally there is just a tiny amount if space between where your bird steps up and your hand. Then you let them step into your hand. They may out there beak in your hand first to test that you are stable, that's ok. It can take days or weeks, rarely months. You can practice this several times a day, as long as your bird is positive about the experience and doesn't get bored or frustrated.
We have tips on bonding, under general parrot I formation forum at the top highlight in blue, read those. I don't like ckicker trainings though many people do. I just say good birdie instead of clicking.
I'm attaching this link to some good info , I like this article a lot.
https://lafeber.com/pet-birds/stress-reduction-for-parrot-companions/
