To travel in another country, you need visa permission, similarly to go back to Godhead you need permission & mercy from his pure devotee.
Srila Prabhupada has given us the perfect process. Now mold yourself according to that and I assure you that you will go back to Godhead.
One can understand the Supreme Personality as He is only by devotional service and when he is in full consciousness of the Supreme Lord by such devotion, he can enter into the kingdom of God. — Bhagavad Gita, 18.55.
Don't think that just you take initiation and spiritual master will take you back to Godhead. You have to become serious otherwise opportunity of going back to Godhead will be lost.
Without being self-controlled, without being disciplined and without being fully obedient, no one can become successful in following the instructions of the spiritual master and without doing so, no one is able to go back to Godhead.
Even at the last moment of your life, if you remember Lord Krishna… You can go back to Godhead.