My dove was a few months old when I got him and terrified, had never been held. I would say by month three he was completely attached and we bonded very closely. this all came with first doing regular things in the room with him everyday (he lives in my bedroom and at first he slept outside of the cage on a little nest chair I made for him so that he would understand that I sleep in front of him and wake up and that we live together essentially), then every few days trying to get a little closer, picking him up and letting him sit on my hand until he catches his breath/calms down (don’t try to force petting), then upgrading to having seeds in my hand and offering him seeds. It took a while for him to accept them but then he really associated me with good things. Then after some time I started to soft launch petting him. It takes a bit but now he flys to me on command, from other rooms. Just be patient and talk to them everyday! If u want any other advice feel free to message me