“Except a man be born again, he cannot see the kingdom.” John 3:3
To be born again is to be born anew. God desires that you be born anew.
When you become born again, you become a new man.
“If any man is in Christ, he is a new creation; old things are passed away; behold all things become new.” II Cor 5:17
How do you become born again? It’s simple: you need to receive the finished works of Jesus on the cross. You do that by believing in all Jesus did in death, burial and resurrection, and confessing it with your mouth.
“That if you shall confess with your mouth the Lord Jesus, and shall believe in your heart that God had raised him from the dead, you shall be saved. For With the heart man believes unto righteousness and with the mouth confession is made unto salvation.” Rom 10:9-10