How do I dominate someone as a submissive

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My partner recently told me he wants to be submissive more often. I have no clue how to do this as a 5,2 women and he’s a 6 foot man. I have no clue where to start or what to say. He’s a switch but has really been wanting me to take the lead. I tied him up and performed cowgirl but I had no idea what I should do other then that. Someone help me!