Patience is the key to anything in the animal kingdom. But if he will accept treats from you, theres no reason why you can’t start clicker training.
Here is an article the forum owner wrote, it’s a great article - I wish I had found it when I got my first bird.
http://theparrotforum.com/viewtopic.php?f=11&t=227A bird talking is as unique as they are. Some birds will, some will not. Some can but refuse to, some can not. However I agree with Naurthon, they seem to talk more when you are out of the room, or away from home. However when he does start to talk, click and reward it, even just praise it to high heavens and they will become more apt to do it more frequently.
As far as the talking / whisteling debate, I am not sure which holds true, so when you find out – be sure to come back and let us know!
As for a bond, some people you click with and some you don’t that’s why we date to find the right one and why the term “ex” is common. With anything the bond can happen quickly, other times it takes years to form. But in either case, don’t give up. Patience is key!

Careful what you wish for, my lil

is a jabberbox! He constantly asks me "wha do'n" and when I answer him, (dishes, laundry, sweeping,) he laughs at me!