I want to thank each and everyone one of you that expressed your concern and shared your advice and suggestions for Kingy. Your thoughtfulness and kindness have not only helped me to work through this but also, with Kingy.
It was my neglect in not caring for the coop and Kingy until I saw him losing his balance and not perching; which by the way, he is still taking the prednisolone in a very small dose of 2.5mg daily for one more week. Not showing improvement but he's perked up some.
However, I did follow-up on some of the suggestions given. The ramp unfortunately, was somewhat buried with all the dirt they've been digging around it so I think it did sink a little which made the ramp steeper. We've added more slats or strips of wood in-between the existing ones giving it about a ~2"-2 1/2" step. Also added a brick at bottom to lessen the slope. The first day, I think Kingy was surprised that he could actually walked briskly up the ramp without falling! Everyday after that, he's still kinda hesitant to take that initial step (which we'll have to improve) but once he does, he can easily go into the coop!!! Oh, I'm so happy and so relieved!! But our work is not done. This weekend, we'll lower the coop by half. He's not getting any younger and I just want him to be happy and live comfortably. You guys are amazing! Now I'll need to find out how to make his bedding more comfortable as he sleeps on the floor of the coop. Will create another thread. Special Thanks to all of you!!!