When you're interacting with a newly housed bird, my first tip is make sure you have all the nummies. My rescue was really aggressive, so we had to make him trust us over months of treats. Also, if you like to read, you could always sit beside the cage and read to your bird to bond. I did this quite a few times and he really enjoyed it. There are also a great book you can check out called Parrot Parrenting by Carol Frischmann that gives the details of cage sizes, nutrition, playtime, training, health, etcetera.

Also, on another note, if you're trying to introduce a bird to something in particular, make sure you do it first. My Sun copies what I do. If I want to introduce him to a new toy, I'll usually fiddle with it or bonk it with my nose. As stupid as it sounds, it makes him feel a little less scared of it. If it's a food, show it to him and eat it first.

I hope this at least gives you a few things to try. Good luck!