Will evil someday come to an end? The answer to that question is yes. Since Adam and Eve fell into sin as recorded in Genesis chapter three, we have lived in a fallen world. As you turn on the news today, we see the results of a sinful world. In the days of Queen Esther there was an evil plan to murder all the Jews in the Medo-Persian Empire. The people called out to the Lord in prayer and fasting and God prevented this evil plan from taking place. The Lord used Queen Esther, who was also a Jew, to defeat this malicious plan hatched in the pit of hell.
You may think that God is slow to act in regard to destroying evil, but nothing could be further from the truth. The Lord is all knowing and knew His creation would rebel. The Lord also had a plan to send his Son Jesus into the world to rescue mankind. Ephesians 4:4 Even before he made the world, God loved us and chose us in Christ to be holy and without fault in his eyes. 5 God decided in advance to adopt us into his own family by bringing us to himself through Jesus Christ. This is what he wanted to do, and it gave him great pleasure.
When God sent Jesus into the world, He accomplished several things.
1) On the cross Jesus would pay the price for our sins and defeat sin, death, and the devil. Jesus was victorious. He is the Lord of Lord and King of Kings. 1 John 3:8 The reason the Son of God appeared was to destroy the works of the devil.
2)Those who place their faith in Jesus as their Savior can be adopted into the family of God.
Jesus defeated satan on the cross, but when will evil come to a complete end? The book of Revelation 20:10 tells us when Jesus returns a second time that will be the end of satan and all evil. 10 Then the devil, who had deceived them, was thrown into the fiery lake of burning sulfur, joining the beast and the false prophet. There they will be tormented day and night forever and ever. 
Before Jesus comes again, remember we fight FROM Victory not to victory
When you’re fighting from victory, you have the confident assurance that God is in control, the battle is in His hands, and the victory has already been won! Through His death on the cross and the power of His risen life, our sins are not only forgiven, but we have been given the victory over sin and Satan! We still live in a fallen world. The enemy is relentless in his efforts to deceive us and tempt us, but we don’t have to fight for victory. We can fight from victory! In 1 Corinthians 15:57 Paul declares, But thank God! He gives us victory over sin and death through our Lord Jesus Christ. 
To hear more about the story of Esther, listen here: https://podpoint.com/light-of-christ-church-podcast/hope-when-genocide-threatens