I have no idea what you just said.
But have you EVER confessed ALL your sins?
You know, every sin that you’ve ever done? The ones you don’t remember from your childhood? The moments of anger or lust that flash across your mind and then are forgotten? What about every moment that you don’t perfectly love God with all your heart and soul and mind, and don’t perfectly love your neighbor as yourself?
How on earth do you find time to post on FR and not just sit in confession 24 hours a day?
And what on earth do you mean, “Justification for mortal sin?” If you mean Christ’s justification, then it’s for ALL sin, not just what you define as ‘mortal.’
Hence, Purgatory.
.
Little by little......