All that you have posted is correct and good to understand. But we need to understand it in light of the Cross.
Agreed.
The main focus of Christians should be (a) the propagation of the true and full Gospel throughout the world, (b) the edification of the saints through the pure Word of God, and (c) personal growth through the sanctifying power of the Spirit and the living Word of God.
We need to be salt and light in a crooked world. And God had already shown us that evildoers and seducers will wax worse and worse until the Man of Sin be revealed.
But that is not the end of the story. The kingdom of darkness will be totally destroyed by the Lord Jesus Christ at His coming. And He will rule over all the nations with a rod of iron. After that all the evildoers will face eternal damnation.
DANIEL 7: CHRIST WILL HAVE AN EVERLASTING KINGDOM ON EARTH VERY SHORTLY
13 I saw in the night visions, and, behold, one like the Son of Man [Christ] came with the clouds of Heaven, and came to the Ancient of Days [God the Father], and they brought Him near before Him. 14 And there was given Him dominion, and glory, and a Kingdom, that all people, nations, and languages, should serve Him: His dominion is an everlasting dominion, which shall not pass away, and His Kingdom that which shall not be destroyed.
The Beast (the Antichrist), the False Prophet, and Satan himself will all be cast into the Lake of Fire for eternity:
And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived them that had received the mark of the beast, and them that worshipped his image. These both were cast alive into a lake of fire burning with brimstone... And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever. (Rev 19:20; 20:10)
We believers instead look for a New Heavens and a New Earth "wherein dwelleth righteousness". That is God's ultimate plan. But the New Jerusalem -- the eternal home of the saints -- will then give light to the earth, and that light will be the glory of God and of the Lamb.