As Brent Roberts and Hee J. Yoon wrote in a 2022 review on personality psychology, “Although it is still widely thought that personality is not changeable, recent research has roundly contradicted that notion. In a review of over 200 intervention studies, personality traits, and especially neuroticism, were found to be modifiable through clinical intervention, with changes being on average half of a standard deviation over periods as short as 6 weeks.”
