Female led relationships discussion

Alright, my future fiancé and I have been together for five years, spending the last three exploring bondage. We’ve reached a stage where she’s cuckolding me while I’m locked in chastity—I am her total sissy bitch. But what I really need is advice from those of you with more experience: both female-dominant men and dominant women alike. How can I genuinely demonstrate to her how serious I am about being fully submitted to her? Also, any general tips on the steps I should take to become the best possible sissy bitch for her would be greatly appreciated.