No. Nobody has to practice self-anything to get into heaven.
And your soul does not perish when you say *I did enough*. Your soul was already perished.
As long as *I* is in it at all, you will not be saved.
It's JESUS did it for me.
No, self-denial not is the way of salvation, death to self is. When we die in Christ, we are raised with Him, and it's nothing we do to earn it or deserve it as it's by grace, without effort on our part.
And the difference is?
If any man will come after me, let him deny himself, and take up his cross, and follow me (Matthew 16:24).