As I before said, The Gospel isnt a to-do list, its a message of the reconciliation of God with man. It's the Holy Spirit who molds us and shapes us and perfects us.
We don't come to faith in Christ perfect, we come faulty and broken, and we lay it all before Him. He takes us broken sinful people and works in us to bring us to our glorification.
"fixing our eyes on Jesus, the author and perfecter of faith. For the joy set before him he endured the cross, scorning its shame, and sat down at the right hand of the throne of God." Hebrews 12:2
He is the perfecter of our faith. Are you the Holy Spirit that you know the areas I need to work on most?
We are to encourage one another yes, but proclaiming that all (but yourself of course) are in a state of adultery and sin, is to be in need of removing that mote from your own eye.
Do you see a brother you know struggling in one particular area? Pray for him, offer to help him, encourage him in his trial toward overcoming it, give advice if you've been there too..
but strangers? Share the Gospel, share this message of reconciliation, share the love of God, His mercy, share salvation in Christ, share your testimony, share what Christ has done for you, love one another as Christ loved you.
Don't place yourself in the place reserved for God, the Judgment seat of Christ, humble yourself and place yourself as servant, and share what God has given you to share..