Just a quick note about the Bible passages you listed. They were written almost 2,000 years ago.
This means that in our understanding we could be at the 200th king already. Or do you know how we should understnd these things... the way they should be understood?
For example, Revelation 20:3 says:
He threw him into the Abyss, and locked and sealed it over him, to keep him from deceiving the nations anymore until the thousand years were ended. After that, he must be set free for a short time.
But Peter says at 2 Peter 3:8:
But do not forget this one thing, dear friends: With the Lord a day is like a thousand years, and a thousand years are like a day.
When somebody talks about the abyss time of the dragon being a literal thousand years, he isn't agreeing with the way "thousand years" was used by people 2,000 years ago. The thousand years in the abyss is a very long time, but it isn't measured anywhere exactly as a thousand years like we understand it literally.
When you put these things together, it's possible that the Dragon is already up from the abyss, and that we are at the end of the reign of the eighth king. But it could be anywhere along the line, because of the reign of Christ and His people.
Many people think that Christ will reign on earth for a thousand years. And he has reigned on earth for the great period of time the "thousand" means. The reign started with His resurrection, and especially in His people at the time of the Pentecost.
In the political world of today, especially with all the riots going on right now, the Christians are too strong... yet. The time is near where they will be weakened (even though their weakening has happened many times over these last 2,000 years). This weakening will go along with other things that have never happened in the world before. This is how we can determine that the time of Jesus's return might absolutely be now. Consider Revelation 13:10:
"If anyone is to go into captivity, into captivity they will go. If anyone is to be killed with the sword, with the sword they will be killed." This calls for patient endurance and faithfulness on the part of God's people.
Remember, in all this, that when John penned the Revelation, he probably didn't have in mind an expanse of 2,000 years. A long time to him might have meant well under a literal 1,000 years. But here we are again, God's faithful people being trodden down at various places in the world, just like Revelation 13:10 says.
Just to show us how this time might be different from all the times of the past 2,000 years, consider who Satan, the Dragon, really is (was). He was probably the most powerful and glorious angel that God made. 2 Corinthians 11:14 suggests that even after he had lost much of his power, he still could make himself look like an angel of light to people. And remember that Revelation 20:3 says that he will come up from the abyss (death) for a short time.
What would Satan like to do if he could? He would love to enter the hearts and minds of all people, to use their power given to them by Christ (through the Holy spirit) to make machinery to retake his position in the heavens. Here we are, making rockets for him, so that he can go to the stars with and in us.
There is a lot to all of this. We could discuss for some time. But go to the websites I listed, above, and read the commentaries from great Bible thinkers of the past.