For “everyone who calls on the name of the Lord will be saved.” But how are they to call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? And how are they to preach unless they are sent? As it is written, “How beautiful are the feet of those who preach the good news!” But they have not all obeyed the gospel. For Isaiah says, “Lord, who has believed what he has heard from us?” So faith comes from hearing, and hearing through the word of Christ (Romans 10:13-17 ESV).
“But in your hearts regard Christ the Lord as holy, always being prepared to make a defense to anyone who asks you for a reason for the hope that is in you” (1Peter 3:15 ESV).
And Jesus came and said to them, “All authority in heaven and on earth has been given to me. Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age” (Matthew 28:18-20 ESV).
“But the word is very near you. It is in your mouth and in your heart, so that you can do it” (Deuteronomy 30:14 ESV).
“And as for me, this is my covenant with them,” says the LORD: “My Spirit that is upon you, and my words that I have put in your mouth, shall not depart out of your mouth, or out of the mouth of your offspring, or out of the mouth of your children’s offspring,” says the LORD, “from this time forth and forevermore” (Isaiah 59:21 ESV).
Preach the word. Share the Gospel with your mouth. Plead for His grace to help you do it. Fail on human terms and let God determine what is successful. His Word has and will triumph in bringing His sheep into His flock, bringing the captives home and brining life where there was death.