Language Goals

I researched language fluency level and came across the Common European Framework of Reference. I reproduced the framework here so that I can come back to it in the future and gauge my fluency at any given time. My dream is, of course, to reach the “Mastery” (C2) level. However, to reach this stage I must be able to overcome what Seth Godin calls “The Dip” and in my opinion that starts at B2. Will I be able to surpass the challenge and not quit prematurely?