Spend time with them but don’t force them. Give them treats. My son sat with his barred rock and rir when they were chick they climb all over him. They still follow us around like dogs. Lol. Some will never be close but others will be your best friend, it depends on their temperament, breed and personality
Treats and regular handling. Once they realize you have what they want, they'll be interested in you.
But handling is important. Be consistent. My juvenile guineas didn't like being handled at first, but I worked with them usually 4 or so times a day (plus feeding) and now, when I go near the pen, most of them run to me.
Treats and food and more treats. Chickens are food motivated.
My flock are all tame enough to be handled when necessary, and I have a few who want to be in your lap as often as possible. They were tamed by meal worms and melon
Just remember not to let the treats be more than 10% of their diet. (they're a lot like kids, they would rather have candy than broccoli.)
Schedule the chicken candy too.
I know im a lot more likeable around dinner.