i would suggest some things. one is tantra. get a video of tantra practices. it deepens things.
also i suggest the book "getting the love you want" which helps a lot
i suggest meditative practices.
but for the deepest, truest changes i suggest nonviolent communication. it is a practice created by marshall rosenbert that actually works (for me) to dramatically improve my marriage and the intimacy and closeness i feel as well as love in my relationship. it's not easy, you have to work to improve your skills. but your spouse doesnt' have to know the techniques. it works like a charm. this is my #1 suggestion if you really want to improve your marriage.