"As we approach chapter twenty of the Revelation there are four primary scenes presented in the chapter. As the curtain rings up, the first scene is the chaining of the dragon. “And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand. And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years. And cast him into the bottomless pit, and shut him up, and set a seal upon him…” (Rev. 20:1-3). In the vision John sees an angel descending out of the heaven with a great chain in one hand and the keys of the abyss in the other. He lays hold on the dragon, fetters him, throws him as it were bodily into the pit, clamps down the lid, seals it shut, and shut it remains for a thousand years. The question follows — is John seeing and portraying literal fact or is it a spiritual truth stated figuratively in the form of a drama?"
Much more in the link:
https://www.godfire.net/eby/rev216.html
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"In the preceding chapter we saw the beast and the false prophet captured and Babylon destroyed. But what about the dragon? Not a word there about “that old serpent”! Bear in mind that the beast, the false prophet, and Babylon are all manifestations of error, religiosity, carnality and evil. But the dragon is the cause behind the manifestations. When the nineteenth chapter closes, though the outward expressions of carnality have been brought to judgment, the instigator of these, the devil himself, is still at large, and just so long as he is at liberty to roam about, as long as deception, religiosity, carnality, lust, and sin continue in the heart of mankind, the dragon will build other Babylons and breathe falseness into other prophets. You have not destroyed the devil when you have destroyed the works of the devil! To the undimmed vision of the Seer of Patmos it is as clear as day that the work of God within man would not only destroy the works of the devil but ultimately would put the very spirit and power of deception, carnality, corruption, and evil in secure, effective, unbreakable bonds where in his confinement he is unable in any way to carry out his purposes."