When i got her she was only slightly friendly, but i kept getting her slightly better and then she kept getting worse again. Now she hates me, wont let me touch her, talk to her, nothing

In july Gluttony was born, his the bub of my dads IRN's. He was the only bub to survive. I handraised him from 2 weeks old and i was aloud to keep him. He would let me do anything to him, hug him, pat him, kiss him, put him on his back, and he always wanted to be with me. In the last couple of months he is becoming not as friendly. He lets me kiss him, and he chews on my finger nails but thats about it. His always been really scared of new things and i thought that was because he was raised by himself.
ATM im really sad, I know ringneck make terrific pets but maybe im not the right owner for one?
I have a conure, have had her for 2 years now, and shes still as friendly to me as the day i got her.
I am really thinking about putting Gluttony in an averie cause there is no way i could sell him! But it would be heartbreaking
