From personal observation and from what I’ve seen working with my students is that personality doesn’t change with new language.
Learning English won’t turn you into the next Steve Jobs.
What the English language can do for you is
open new doors and create better career opportunities. It might give you a chance to meet new people, move to a foreign country, basically change your environment. In order for you to change, there has to be a change in environment.
Living in the same place, meeting the same people and doing the same thing can’t change who you are in terms of personality.
Only a change in environment could lead to personal transformation and a foreign language could give you that, and especially the English language – the only true global language.