Paul continues his emphatic message to the church in Ephesus, not to guilt and shame, but instead to remind the believers of their true identity as Christians. Repentance is coming in to reality and rejecting falsehood; believing our identity is truly and only in Christ.
Let go of the "try harder" mentality - that isn't what Christ taught us. Instead may we turn and believe God in our minds and hearts that we are exactly who He says we are. Until we do that, we're in danger of living in denial of our new and true identity.