How to Be Dominant as a Submissive Person

Me and my partner have been together for 3 years now and just recently he told me that he is submissive in a sense. Our sexual relationship has been him dominating and overpowering me (he is physically stronger than me) and we both like this. But he brought up that he occasionally wants to be called a good boy or even be told that he’s not doing enough to make me cum. So like praise and degradation. He said it lights a fire, kind of, to show me how good he is. We still want the physical side to be him dominant and be submissive but I guess the verbal/mental side to be switched. I am not a dominant person and this is something totally new to me. It’s always been the other way around.

I guess what I am trying to ask is what can I say or do to make him more happy/pleasured now that I know this side of him? In theory I can try to be dominant but in practice I’m afraid that it’ll seem stupid or that I can’t really hold up to my word. How can I show him that I am serious and that I can be a dominant person even though I’m still a “bottom” (I am a female if that helps)