Hi there and
to the forums!
Falco sounds like a sweetheart.
It's important to recognize that there's not a set timeline for bonding or for trust building, even if you do all the right things like taking it slow and at his pace, and not pushing him. By continuing to interact with him at his pace he will continue to trust even more in you.
When you do interact with him, do it without conditions, i.e don't make him associate coming on your hand with being forced to come out of the cage if he doesn't like that.
FaeryBee has given good advice as well
Meanwhile, you've come to a great place to learn even more about budgies! We're so glad you've decided to continue your budgie research and journey with us here
We look forward to seeing you around the forums!
Be sure to read through all of the forum's many articles and stickies that we have here! If you have any questions after reading through everything, be sure to ask as we'd love to help.