I have two guide posts that drive my answer to this question...
2 Corinthians 4:3-4
3 But if our gospel be hid, it is hid to them that are lost:
4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
This drives me to share the gospel. I don't want the lost to be lost
Then
John 10:16
16 And other sheep I have which are not of this fold; them also I must bring, and they will hear My voice; and there will be one flock and one shepherd.
This gives me the comfort that no matter my efforts, God has his own plan in his own way.
I am required to take the gospel he has given me to every place I can. To share his word as best I can in all the ways I can.
But it is God that saves. not me.