The "I" which believes "I am john" is the same "I" which achieves Self Realization. After all ignorance is destroyed, this same "I" achieves Self Realization.
You can get detail understanding by visiting this link:
In English: https://www.dadabhagwan.org/path-to-happiness/spiritual-science/who-am-i-realize-your-true-self/
In Gujarati: https://www.dadabhagwan.in/path-to-happiness/spiritual-science/who-am-i-realize-your-true-self/
In Hindi: https://hindi.dadabhagwan.org/path-to-happiness/spiritual-science/who-am-i-realize-your-true-self/
