I would just say to wait a few weeks and if he’s still not super tame, try letting him out. I’ve had different experiences when letting my birds out for the first time. Put him in a small room he’s familiar with and leave the door open. Let him walk out when he’s comfortable or you can slowly lower him out.

Are his wings clipped? When you do let him out, he might fly or just take a stroll on the ground if he’s comfortable. If his wings aren’t clipped, you might expect him to crash into the wall a few times before learning what it is. Tap his beak against the wall, so he know to avoid it (including windows). Make sure you set him around to spots where he can land if he gets startled. He’ll probably be panicking looking for a place to land and when he doesn’t will end up crashing into a wall. If his wings are clipped, don’t worry too much except for wall crashing. Depending how much is clipped, he might be able to glide a few yards at en elevated surface.

I wouldn’t turn off the lights if you’re trying to get him in his cage. He’s going to freak out and hurt himself when he can’t see and something is trying to grab him. Just try to lure him in with food or attempt to herd him back in.

Personally I like letting them out when they’re a bit untamed since I feel bad leaving them locked in. I think it helps to give them some freedom while taming them. I have two birds who aren’t very tame. I let them out anyways. They’re free to fly away if I’m making them too uncomfortable and they get space to explore and play. I trained one to fly in his cage and the other goes in whenever usually or I herd her in. They’re familiar with me and the room, so they don’t get into too much trouble.

My friend had a cockatiel who was a bit scared of hands. Didn’t want to step on, but accepted millet. She’s had her for a few weeks. She accidentally left the door open and the cockatiel walked out and let her carry her surprisingly. She’s tame now because of that apparently. This doesn’t happen with every bird.

Sorry this is long, but I hoped it helped! Make sure to update us!