Ok, here it is very simply, straight out of Scripture.
According to the Bible we will all spend eternity in one of two places (Matt 25:46 ). God doesn't take pleasure in the death of anyone (Eze 18:32 ). Without repentence, people perish (Luke 13:3, 5 ). God doesn't want anyone to perish, but all to come to repentance (2 Pet 3:9 ).
God chooses to use preaching the Gospel as the means for people to come to repentence and faith to be saved (Rom 10:13-15 ). He chooses to use us and we are commanded by the Great Commission to go out and tell other people (Matt 28:19-20, Mark 16:15, Acts 10:42 ).
We will be held accountable for our disobedience (Eze 33:8-9, Acts 20:26-27 ).
He has empowered us by His Spirit to go forth, proclaiming the Gospel (Acts 1:8 ). And He has given us instructions (2 Tim 4:5, 1 Cor 9:22, Acts 20:21 ).
Be ready for that day, when each of us will give an account to God (Rom 14:12 ).
What are you waiting for?