Like mentioned, just sit with him doing other things(eg. phone, laptop-no cords, read, etc) and let him learn to feel safe in your presence. You basically sit and ignore him for the most part. You don't want to try and pet or anything at the start. He'll eventually get curious about you and approach on his own. This could take several days, weeks, sometimes months with very timid or nervous rabbits. Rabbits take a lot of patience to earn their trust.
As he gets more comfortable approaching you and you being around, gradually you can start slowly reaching out a hand for him to smell, then eventually maybe a little scritch on the head, then one day he'll gladly accept head rubs. Don't force it, especially don't try and pick him up, or it could set back any trust you develop with him.
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Something else to consider, is if your bun is the blue eyed white lop in your profile photo, some blue eyed rabbits can have vision and/or hearing issues. So keep that in mind with your interactions with him. You may need to do things a little differently if you think this is the case with him.