Congratulations, that's great news for you. Happy that you're already seeing such positive results.
I was recently approved to start the Dupixent as well and had my first injection last week. I haven't had the dramatic positive effects that you describe, but have noticed I've had a little less frequent need for my inhalers. I am on Breztri as well along with Combivent-Respimat as a rescue inhaler.
Your positive story certainly gives me hope! I'm remaining optimistic and patient. Looking forward to see how others respond to this as well.