Hebrews 10:18
It’s simple: those who still want to make sacrifices do not believe in the ultimate sacrifice of Jesus (and that means hell, Matthew 7:21-23). Because all of our sins were punished once and for all in Jesus 2,000 years ago. Those who accept this faith are blameless and holy before God (Colossians 1:22) and are no longer condemned by God (Romans 8:1), because the ultimate sacrifice for our sins was made by Jesus.

We, who believe in the finished work of Jesus, are completely and forever forgiven.

“And where these have been forgiven, sacrifice for sin is no longer necessary.” (Hebrews 10:18; NIV)

So you don’t need to beg for the forgiveness of your sins, but joyfully thank your Jesus for having forgiven you all your sins, and ask for invigorating help so that you sin less and less.