The only way that any of us can have peace is by believing and obeying the gospel preached by Jesus Christ and his apostles.
Jesus Christ is God’s offer of peace to all who will believe.
Luke 2:14 Glory to God in the highest, and on earth peace, good will toward men.
Faith in Jesus Christ is our source of peace.
Luke 7:50 And he said to the woman, Thy faith hath saved thee; go in peace.
Luke 8:48 And he said unto her, Daughter, be of good comfort: thy faith hath made thee whole; go in peace.
John 14:27 Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid.
John 16:33 These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.
Acts 10:36 The word which God sent unto the children of Israel, preaching peace by Jesus Christ: (he is Lord of all:)
Peace is promised through Jesus Christ
Colossians 1:20 And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven.
Romans 2:10 But glory, honour, and peace, to every man that worketh good, to the Jew first, and also to the Gentile:
Romans 5:1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
Romans 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
Romans 14:17 For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
Romans 14:19 Let us therefore follow after the things which make for peace, and things wherewith one may edify another.
2 Corinthians 13:11 Finally, brethren, farewell. Be perfect, be of good comfort, be of one mind, live in peace; and the God of love and peace shall be with you.
Philippians 4:6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. 7 And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
Colossians 3:15 And let the peace of God rule in your hearts, to the which also ye are called in one body; and be ye thankful.
James 3:18 And the fruit of righteousness is sown in peace of them that make peace.
May I suggest that you read: ‘Your Share in God's Promises’ here:
I hope you find this helpful.