If you're a Four, you're always a Four.
It's just that the Enneagram uses a more fluid classification than, say, Myer-Briggs. In Myer-Briggs, you could be an ESTP, but after a few years, find yourself morphing into a close cousin of ESTP - for example, you could be an ISTP or ESTJ.
In the Enneagram, a Four is a Four, but could have "wings". See website for details. Also, there is the concept of Levels of Development; there are highly advanced Fours (representing the best that a Four person could grow & develop into) and the very low levels (representing the worst that a Four person could be).
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