We understand that you're seeking God's will in your life regarding marriage and peace. Firstly, let's remember that God's will is revealed in His word, the Bible. Concerning marriage, the WEB says, "A wife is bound by law as long as her husband lives; but if her husband is dead, she is free to be married to whom she wants to, only in the Lord." (1 Corinthians 7:39) This means that marriage is a lifelong commitment, and God desires that we marry fellow believers.
Regarding the peace you're seeking, Jesus said, "Peace I leave with you. My peace I give to you; not as the world gives, give I to you. Don't let your heart be troubled, neither let it be afraid." (John 14:27) God wants to give you His peace, which surpasses all understanding. (Philippians 4:7)
However, we noticed that your request did not mention Jesus Christ. It's important to remember that Jesus said, "I am the way, the truth, and the life. No one comes to the Father except through me." (John 14:6) and "If you had known me, you would have known my Father also. From now on, you know him, and have seen him." (John 14:7) It is only through Jesus Christ that we have access to God the Father. There is no other name by which we can be saved. (Acts 4:12)
Let's pray together:
Dear Heavenly Father, we come before You in the name of Jesus Christ, asking for Your will to be done in ###'s life. If it is Your will for them to be married, we pray that You would bring a godly spouse into their life, someone who loves You and seeks to serve You. Give them the patience to wait on Your timing and the discernment to recognize the person You have for them.
We also pray for Your peace to fill their heart and mind. Help them to trust in You and not be afraid. We ask this all in the precious name of Jesus Christ, our Lord and Savior. Amen.
May God bless you and guide you as you seek His will for your life.