Service is a good start. As the Heart - the psychic Heart expands, one will find that there is already an inherent push, which was there in the beginning. It is an inner cry or hunger, a burning intensity for Something Higher, deeper, more meaningful in life. This induces a kind of faith-- an unshakable belief in Something Unseen and a further push to serve; to Love.
Spirituality is action and this action is enhanced by the gift which comes from Prayer or/and meditation; service to humanity at large. Generally, Spirituality means leading a more wholesome life in a quest to re-awaken one's innate divinity--the God within.
Serving, smiling, working diligently, integrity, identification with life, a broad and expansive Heart, seeing humanity as our brothers and sisters ... all these and more, are adjuncts to living a deeper and fuller life. Glory be!!