You could reasonably refer to Dave and Susan as highly successful individuals, in the same business, but at opposite ends of the " market "
What Susan does, is what she learned to do, from her father, but after encouragement on this forum, from a few individuals, she raised her prices and even purchased a T/M, but by raising her pricing gently, she has retained most of her clients.
Dave is a charismatic and very outgoing character, who's success is based, I feel on his character and personality, allied to a meticulous approach.
Everyone else, is somewhere in between....................can you learn from these two successful people, or do you have too much conflict going on, from the " advice " of others.
Replicating Daves approach, will be extremely difficult and unlikely to work for 99.9% because he is, as I said, very much an individual................but, you can " get a rub " off successful people, if you talk with them, meet with them.
Susan was raised in the low price / high volume business and has proven what many already know, that you can give a high value service at a moderate cost and you will always be busy.
As you have virtually no chance of cloning Daves business, you could, " bite the bullet " and just get on with it, as Susan and many others do, successfully, or you could try to become like the Mikes, Shauns, Chrises, Pauls, Steves, etc, who all have individual approaches, that work for them, but will it work for you ?
Whichever route you choose, will involve discipline and patience.