As a transitional phase, what do you think of a three-some with a milf and a woman closer to your age? Trying to make yourself avoid something you like doesn't tend to work very well. The direct approach just tends to make you want something more. For that matter, it doesn't really sound like there is a particular reason to want to make the change to something else. You mention that you are concerned about being submissive, but a lot of people are different in bed than they are in the rest of their life. There is no reason why it would make you less dominant in regular life; a lot of very dominant people have fantasies of taking a more submissive role in bed just for variety. If you are sure you want to change, though, I think you are better off adding to rather than taking from.

And welcome to PC.