Career stagnation

I love my job as a physiotherapist, but I have reached a point in my career where I feel I am stagnating. My diary is always full and I am popular with my clients, but I want to move to the next level – reach out to more people, specialize in a specific area and earn more money, but without suffering from overwhelm and burnout. I am currently keeping myself stuck in a cycle of I want more, but I don’t know what I want. What courses do you think will help find more clarity?