Since no one has answered you, let me try to provide some answers.
Evangelization is the precahing of the gospel to the sinners, so that God can take out a people out of them.
The challenges facing the 21st century evangelization is the same as that that were faced by the Apostles in the first century. That is the hatred of the world towards those who evangelize, because the world hates Christ. The world resorts to the same kind of actions, including beating and killing, being obedient to Satan. You will read this in Acts.
We cannot solve this problem. Christ did not ask us to solve this as a problem. At the same time, He told us that the world will hate us, becasue it hates Him. The only postitive thing that we are asked to do is to preach the gospel.
If you are not a believer, please read John 3, especially verse 16, along with John 1:1-12.