It may not be your mission to help move history, unless it is. Can you help bring the Divine Kingdom with what you write?
Maybe. God's ways are not man's ways, God's time is not man's time. But what is the second coming of Jesus - the Son of God and Son of Man, anyhow? Look at the first time he showed up - not quite what you'd expect for God in the flesh and the most influential human being who ever lived, if you believe St. Luke. So how he shows up the second time, may not be quite what we expect, he already told us himself it would not be when we expect. If God lives in us and we live in God on earth, can our writing empower the manifestation? Good chance of that, I think. Look to the unusual story of the road to Emmaus, and what happened at supper there. He may well be among us every day, and we may never have proof of it one way or the other, it could be a matter of faith that will never be shaken. We ask for a sign, and we can't read the signs of the times. Tough question.
If it weren't for Christian writers there would not be such a huge following of the faith on earth. Having said that, those writers were the design of God in the first place, having anointed many to write as led by the Holy Spirit and to reveal the Word of God to the unsaved for the purpose of growing the Kingdom. The bottom line - no, we cannot help manifest the second coming. It has already been established in God"s timeline.