Sociotype is one of 16 types in socionics. Each sociotype has its strengths and weaknesses in accordance with leading lens of perception.
Sociotype never changes. You and everything around might change, but lenses of perception and so do your eyes, stay the same. You can change your surroundings, politics, habits, field of activity, interests, favorite book genre. But you will still percept all of these with the same lenses of perception.
Socionics, as many other typologies, has criteria for determining the type (something that we take as a basis when we try to understand person's sociotype) and the resulting trends – nature, behavior, traits, skills… If to draw parallels with the «M/F» typology, criteria for determining that you are male would be sex characteristics, hormones, set of chromosomes in your DNA. And tendencies of manifestation of your masculinity would be courageous behavior, tone of voice, short haircut etc.