Matthew 5:48 says - “Be perfect therefore, as your heavenly Father is perfect.”
Now that sounds like a high bar to get over! “Be perfect”! How is that even possible if it means “sinlessly” perfect for the rest of our lives.
I think Matthew means for us to understand that God wants us to grow, for the rest of our lives, to become more and more, like the God who made us; to realise our God given potential.
In Philippians 2:12f., Paul helps us understand how we go about reaching that potential.
We’re to work out (practice/rehearse it), we’re to be patient and we’re to work hard.
May God help us to do it, to do those things that help us grow in Christ Jesus.