It usually takes months before a snake gets "used" to you and some snakes never do. It depends on their personality as each one is different. Also you just gave him a new set up so he needs time to get used to that. Are you sure his temps and everything are good in the new cage? Did you put his old hides and old "toys" in the new cage too so he at least has some recognizable stuff? Also some snakes just don't transition well from cage to cage and the new one might possibly be too big.

As for bonding, I wouldn't even try until you get him eating consistently in his new cage. At the moment it sounds like he is really stressed in the new cage or husbandry is off like temps. That is the most common reason a BP wont eat, especially young ones. Once he is eating good, then you can start to work with him. Take him out for around 5-10 mins every couple days and let him sit on you. Don't move fast or try and go for his head. Just let him "explore" you and learn that you aren't a human Godzilla who is going to eat him. Then you can slowly raise the handling times by 5-10 mins a week. Eventually they will usually relax but like I said, some snakes just never enjoy handling. When I got Vicky, she was tame but shy. After doing what I said, she now loves to sit on me and always holds a finger with her tail and never wants to venture off me. She likes to check stuff out but always holds onto me and returns back to me. Rosey my big BCI is just an explorer who loves to cruise all over and Dottie my BP is just a slug who mostly just enjoys sitting on me or periscoping. Each snake has their own personality and you just got to work with that.

Bottom line is you need to get him to eat consistently first. Once he does that, then start working with him but realize, it is going to be months, not days before he is probably used to you. They aren't like dogs. As for food, don't keep offering him food or that can stress them out too. Try and if he refuses, leave it in there overnight, maybe braining it before you shut the lights off. If he refuses, don't offer again for a week or 2. Then maybe the next time, try a live to see if that entices him.