By making changes to yourself. Everyone has habits, sometimes bad, and these habits will always partially be engraved into your mind even after working to change them, forever always changing your thoughts, even just a little. However making these changes and fixing yourself can create a new, better version of yourself that is different, but also always the same as what it was before. But when you change yourself, the person before slowly fades, however never disappears.
You can paraphrase in whatever makes sense to you. I had a little trouble with this one lol. :)