If I can contribute here. The Revelation was by Jesus Christ. It was a prophecy about what would happen in the future...that time after 90 ad or so when John received it.
It doesn't stand alone. Christ made the same prophecy in different terms earlier...the Olivet prophecy:
Mat 24:3 Now as He sat on the Mount of Olives, the disciples came to Him privately, saying, "Tell us, when will these things be? And what will be the sign of Your coming, and of the end of the age?"
Mat 24:4 And Jesus answered and said to them: "Take heed that no one deceives you.
Mat 24:5 For many will come in My name, saying, 'I am the Christ,' and will deceive many.
Religious deception, especially false Christianity. Horse 1.
Mat 24:6 And you will hear of wars and rumors of wars. See that you are not troubled; for all these things must come to pass, but the end is not yet.
Mat 24:7 For nation will rise against nation, and kingdom against kingdom...
Wars. Horse 2.
Matt 24:7 ...And there will be famines...
Horse 3.
Matt 24:7 ...pestilences, and earthquakes in various places.
Horse 4.
Mat 24:8 All these are the beginning of sorrows.
Sorrows is translated from the greek word for labor pains. So the 4 horsemen began to ride almost immediately after John's time. And as history went on all of these things got worse and worse...like labor pains get closer and closer and more powerful as time goes on. Near the end all of these factors will be strong. And they are.
Thank you for your insight. That helps.