But you don’t know what the heart is
It is NOT the beating heart
It is NOT the emotional aspect
It is NOT anahat chakra ( 12 petal in chest )
It could be the heart described in saundarya Lahiri by Vishnuturthji
It could be the heart described by Abhinav Gupta. He was a fully enlightened person. There is a book sacred Heart of Shiva by Paul Ortega
Sadly even after reading the 300 odd page book you will not have a clue where it is or anything about it
Find a Guru
Bhavin