Hopeful 2 said, So, do you still sin now ?
Yes, I do at 82 years old; they are inner sins, some of which God has given me victory over. For those, I pray maintenance prayers to avoid slipping back into them. Others I struggle in prayer with.
All of them are the desire to control others, escapism, frustration, impatience, impulsiveness, lust, pragmatism, pride, recklessness, and the failure to be constantly joyful and prayerful and thankful (Paul's commands in 1 Thessalonians 5:16-18). There are probably others that God's Word will awaken in me for me to pray about.
How do I pray? I claim Jesus' victory through his death and resurrection--that is, death to those old-nature sins and new life to corresponding new-nature qualities like influence, endurance, patience, self-control, love, wisdom, humility, caution, and constant joy, prayer, and thankfulness--to overcome the sins and put on the God-like characteristics. In Paul's letters, you can find these and many more spiritual needs we have.
I have Peter's words in Acts 2 about baptism:
Act 2:38 And Peter said to them, “Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.
Act 2:39 For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself.”
Peter says that God's promise of the Holy Spirit is for the adults and "for your children." Repentance is essential; then, comes baptism for adults. Now, what about the children? Water baptism for babies and other children is a sign of God's promise of the Holy Spirit following those children's repentance in the future.
Even with adults, faith usually comes first, then baptism, which is nothing more than God's welcome along with the congregation's celebration of the greatness of God's gift of salvation.