Romans 12:2 KJV
And be not conformed to this world: but be ye transformed by the renewing of your mind
‘Be yourself’ sounds like good advice, but like everything moderation is key. You cannot be better than you are now by holding on tightly to the you that have been formed in the past by your younger self. It is good to be true to who you are, but also leave room for self-improvement to become a better you you may have never imagined you could be. “On the last day on earth, the person you became will meet the person you could have become” (Unknown).