Great suggestions made by others already!
Patience. They will gain some confidence with age. They go through little phases. but they quickly learn if you spend enough time in their presence.
Also when do approach slow and low from the front to let them hop on your hand, the opposite of a predator approaching.. don't squeeze tightly if you cup them as those pin feathers are painful when pressed,
When running your finger through their feed like a hen wiping her beak or tid bitting treats by picking up small pieces, dropping them, and use a high pitched voice and rapidly say "look babe, look"! That one phrase repeated does wonders to pique curiosity.
I'm not sure to say anything or not.. but guessing this is your first cockerel? It's okay if he stays shy.. and respects your space. If he is confident enough to wanna sit on your lap.. research ahead and see if you will go that route or not.. Each cockerel and situation is unique and roosters aren't to be feared.. I don't subscribe to the dominance training you might come across.. but learning some chicken body language or communication in order to learn how to read a situation and respond appropriately could be useful in the future. Too friendly seems to set my boys up for failure more often than not.. so no more sweet lap boys for me!