What you bring to the team and your competency
This is something you develop after years of experience and after working with a lot of teams. But, here is a little secret about experience... all it does is keep you from fearing the unknown. Unfortunately, this is the picture from the other side of the bridge. Yes, like most people, you will have to cross this bridge. Add your experiences and learning from working with numerous teams to your tool bag.
Your ability to coach the team
It's no longer about just being able to teach your team. Realistically, how much and how long can you teach from 18 pages? It's time to look beyond the Scrum Guide without casting it aside. Why is this so important? When you started, you were in a teaching, mentoring and advising mode. It's easy for your relationship with the team to become one where you know More and the team knows Less, and they look to you as the expert. The sooner you and your team can get past this stage, the better! You can do this when you shed your role as the expert and become the coach. Yes, you leave all that expertise, experience and knowledge that you acquired over several years at the door and become curious along with the team. You will notice that you no longer respond with expert advice. Instead, you might respond with something along the lines of, "Hmm... that's interesting, let's figure it out together." This response is not out of ignorance, it's out of curiosity to find what else there might be. Thus, you begin the process of instilling a culture of learning and continuous improvement within your team. This is when, instead of looking outwards for answers, the team will start to figure things out by means of experimentation.
It's a new beginning
There will be very few occasions where the dynamic will exist for the formation of an effective combination of coach and team, but that shouldn't keep us from aspiring towards it. Organizations that wish to espouse a culture of innovation could significantly benefit from having teams with a level of agility where they can not only solve problems on their own, but also across multiple teams. These teams would have learned to function independently and collaboratively at the same time and without supervision.
As Scrum Master, you have a very instrumental role to play in the creation of such an ecosystem. But, how will you know when you are ready? Perhaps, when you get comfortable leaving alot of your knowledge, expertise and experience at the door and settle alongside your team for exploration into the unknown.