Honestly, i am far from an expert, as i have very little real time experience, but i think that you should tell him exactly what you just told us. Explain to him that you love that he tells you when you are doing well, but that you wish that you had more structure, and maybe you could talk about some areas in your life, that you might like for him to take control over. You could also share with him that you would like to know some more ways that you could please him. While you cannot just say "hey, dominate me more", you can say that you are comfortable with the rules that are already established, and would love to have some new ones that you could follow, or maybe some rituals that could be added. Maybe things like a bedtime ritual, or a dinner ritual, or even a coming home from work ritual (Him, you, or both).

i do hope that you found some of this helpful. i wish you all the best.