Give him treats he can't really run away for. Offer him the end of a stick of millet and let him eat while you are there. Don't let go of the end.Over time try holding the millet closer and closer to your hand so he has to come on your hand. Also try sitting next to his cage when not busy and just relax there. You can play on your phone or whatever, its just to get them more used to you and realize you are friendly.