Personality Traits Are Not Immutable

"A 2015 study by Nathan Hudson and Chris Fraley indicates that some people may even be able to intentionally change their own personality through sustained personal effort and careful goal-setting. A study of mine published last year, and another by Jule Specht, suggest that positive personality changes accelerate when people are leading meaningful and satisfying lives."

Personality Can Change Over A Lifetime, And Usually For The Better