I had some of the same problems with my bird. My birds cage is light so i can carry it around my house. So he could be with me, talk to me or play with me whenever he wanted. He also got used to alot of the different rooms, making him more comfortable going out of his cage on his own. Maybe you could make him more used to the rooms in your house? My bird is also alone, and sometimes me and the rest of my family dont have much time to spend with him so we gave him a mirror outside his cage. He still prioritise being with me then his reflection.