Can the sociotype change?

According to Victor Gulenko

The actual sociotype is the deep nucleus. Its structure does not change during life (maximum stiffness and stability). The term of its existence is equal to the time of the existence of the psychic system itself. Thus, the socionic type is a constant of the psyche. To directly detect and open it, you need to apply the maximum load to the psyche.

Further, over the core lies the middle layer, which possesses not absolute but only relative stability. It is a variant of type, or subtype. Relative stability means the subtype can change, although this happens rarely and only under the influence of strong life shocks in those moments when the psyche is in a transitional state (for example, adolescence, a midlife crisis, etc.). In the case of the individual psyche, it is a question of a period of dozens of years. The variant of the type manifests itself primarily as a person’s tendency to perform a certain role in a primary group.

Finally, the softest and most mobile psychic layer is formed from the outside — a functional profile, which is often an imprint of the current habitat of the type carrier. It exists for as long as a type carrier resides in it. The usual life of the profile is in the range of several years. The profile can be compared to patterns of behavior. For example, a military environment might make a person coarser; an all-women upbringing contributes to the formation of a profile with emotionality in a child, etc.^[1]

References

[1] Victor Gulenko (2019), Psychological Types: Why Are People So Different?