Rescue dog 🐶 only comes out at night or when we are not home

We put a doggy cam and saw his personality come out at night. He’s playful, wags his tail, is smart and only goes on the pee pad.

We are very patient with him. It’s been 10 days and I just sit next to him, offer him high value treats and he takes them from my hand. When I sit w him, I try not to make eye contact (tho it’s hard, every time I look, he’s looking at me w those big green eyes lol) and I read or journal. I accidentally left my pen on the floor and the next day, I found it in his crate. It was all chewed up, my poor baby. Obviously I know I need to be more careful. He has pen ink all over his back and smells like he needs a bath. I also already have a harness and leash for him. He has not gone outside bc I’m waiting for him to get comfortable.

Google is telling me not to take him out of the crate and let him come out on his own. What if it takes 3 months? I want to take him out on walks and give him a bath while obviously rewarding him. Should I keep waiting and let him still use the pee pads?

His name is Koda btw