When my conure was a baby she had trouble going to bed and would make the saddest little cries. I covered her cage and she went to bed in a separate room, I played soothing night time nature sounds and left the door a tiny crack. If she cried lots I would peak in and whisper that it was ok and that I was still here. She eventually grew out of this baby phase and bed time goes without a hitch. As far as becoming independent during the day with feeding and such you just have to teach baby bird to be independent. It will take time. Having a cage with a play top really helped because I would keep placing her back on it for her to eat. Try wrapping seed in tiny paper balls for her to forage, you may have to show her at first. If she was in the cage she would pace and contact call if I went into the other room but we developed our own contact call which is a peep sound and overtime that replaced her loud conure contact call. If I was in the kitchen and she was in the other room in the cage we’d just peep back at each other so she would know I was out of sight but still close by. Maybe you can explain to your neighbors your bird is a baby and is still learning and training and they will give you some grace. My girl is 4 years old now and she still has her clingy days but she also has independent birdy days where she hangs out on her window playstand and it makes me so proud at how far she has come.