According to Osho, devotion flowers when you drop all faces and pretenses - ego, roles, beliefs - and surrender your whole being. Give your thoughts, breath, happiness, even the 'me' you have hoarded. In that nakedness, inquire 'Who am I?' and discover: 'I am love.' From this recognition, love overflows naturally; devotion is not doing but dissolving the separate self and bridging all divides.
Stop pretending, let go of selfishness, give yourself completely, and you will feel that you are love; that feeling is devotion.