If we were forgiven on one day, then we are forgiven forever.
Ephesians 1:3-8 “Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love, having predestined us to adoption as sons by Jesus Christ to Himself, according to the good pleasure of His will, to the praise of the glory of His grace, by which He made us accepted in the Beloved. In Him we have redemption through His blood, the forgiveness of sins, according to the riches of His grace which He made to abound toward us in all wisdom and prudence.”
When we believed in Jesus, we became forgiven, holy, blameless, perfect, righteous with every spiritual blessing.
We did not get this by our works, and it was irrespective of our past sins.
It was only by grace through faith.
We were declared forgiven on one day.
So if you were perfect on that one day, then you are forgiven and perfect every day of your Christian lives.
It has nothing to do with your works, but only with faith in Christ.