Laying on the floor or just sitting there reading a book or watching tv. Bunny will eventually get curious about you and cautiously approach you. Don’t move or reach for him let him move about at his own pace. He may bump you with his nose or cautiously smell around you.
After he gets more comfy you can try offering a raisin or craisin from your hand. If he shys away put it on the floor at first. He will progress to taking it from your hand.
Just give him some time and space. When he starts to trust you you will know and it is such an exciting thing to experience.
So your cage only has a top door? Bunnies like to move about on their own choice and usually don’t go for being picked up especially at first. If that is the only way out of his cage dont’ be shy about taking him out.
When you do pick him up Put a hand to support his chest behind his front legs and support his rump too. They are more comfy with this type of pick up.
My Ruby will not take anything out of my hand if I am holding her. Weird I know. Cotton he likes to grab the treat and take off with it to eat in a spot he has chosen to eat it in. Buns can be funny that way.
Hang in there patience is most fitting right now. And check out that link to the rabbit site. They have very helpful info.