It's a bit late to be salt and light in the Western world. Derek Prince warned what would happen back in the 1970's. He pointed out that salt is a preservative. It can only keep what is good, it cannot restore what is spoiled.God's world should not be divorced from His Word.
God's faithful including Jesus and Paul did their part to make the world better.
Now it is our turn to be salt and light rather than hide/retreat from the world.
We should also remember that the unsaved are under the control of Satan. The world system, the Cosmos, is Satan's work. It is in opposition to the kingdom of God. Believers are not of the world system. (John 17:14-16)
God's judgement on the world is still to come.
And by that same word, the present heavens and earth are reserved for fire, being kept for the day of judgment and destruction of ungodly men." 2 Peter 3:7