1 John 1:9 is not about forgiveness of sin relevant to restoration of New Covenant promise but about the restoration of intimacy with Elohim. If sin in a Christian’s life could negate the grace of the Cross, then no one could be redeemed by faith as grace would be fleeting and dependent upon works/behavior throughout the lifetime of the Christian.

When one enters into New Covenant relationship with the Father via faith in Jesus as Messiah, they are gifted-imputed the perfection, sinlessness, of Jesus and made “positionally right” with the Father due New Covenant promise (2 Corinthians 5:21; Hebrews 8:12) and they are considered, by the Father, to be perfect…which is necessary if one is to enter the Kingdom of Elohim subsequent death of the body in Time (Revelation 21:27).

1 John 1:9 is provided the Christian by the Holy Spirit not as a restorative prayer of relationship concerning salvation, 1 John 1:9 is given for restoration of intimacy and joy and peace with Elohim which are disrupted by disobedience…much like a wayward child and their parents…the child does not cease to be family due disobedience but relationship and intimacy suffers until things are reconciled.

Even if a Christian sins with aforethought, that sin does NOT break New Covenant promise but the true Christian will be quick to repent as the loss of intimacy is unbearable. If one could see the mind of the Father when a Christian repents, the Father would say, “what sin?”…the Father will not break His Covenant…we repent and seek forgiveness for our own well being as fractured intimacy with our LORD is a miserable life indeed.