„And He said to them, “ Mark 16:15.
Sharing good news with unbelievers is our mission. Jesus wants us to do that. I think it has to be natural for us preaching our faith if we have had strong conversion experience. You do not have to worry about converting part, which is the job of the Holy Spirit. Your part is simply to share what you have experienced, revelation you have got or miracles you experienced yourself or saw in other lives. Of course, it does not have to be unnatural or forced. However, when an opportunity comes, use it to tell people about Jesus.