“Old self” is dead, having been crucified once-for-all with Christ.
“New self” is the new life we now have in Christ: new heart, new mind, new spirit, and the Holy Spirit.
Saved (made a new creation, through new birth in Christ) once-for-all in Christ’s once-for-all sacrifice and eternal priesthood.
All sin(s) forgiven; full fellowship now; no longer slaves to the reign of Sin (original Sin, Adam’s); now held captive by the reigning Lord of Life.
Forever are we reconciled…this is something we will reckon with daily.
As a people with new hearts/minds under a New Cov’t, we are therefore now bearing a new image (identity) that actually shapes our self awareness as Saints (no longer Sinners, in the NC sense).