In Rev. 1, John is told he is being given visions for the encouragement of his companions in tribulation, & the assurance of their high position in Christ: kings and priests unto God and his Father; further, he is in the kingdom and patience of Jesus Christ as we all are: hath translated us into the kingdom of his dear Son (Col. 1.) How many Kingdoms are there? Obviously that kingdom relationship is spiritual, even though Jesus Christ, [who] is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Jesus is King & has all power in heaven & earth.
The vision in Rev. 4 & 5 reassures John that he & his tribulation companions are on the victory side - the Lion-Lamb HAS prevailed to be worshipped with his Father: Blessing, and honour, and glory, and power, be unto him that sitteth upon the throne, and unto the Lamb for ever and ever.
When we move to Rev. 6, & the book is opened, what does John expect to see? Surely the activities of the triumphant Lion-Lamb executing judgement? And I saw, and behold a white horse: and he that sat on him had a bow; and a crown was given unto him: and he went forth conquering, and to conquer. He has gained the victory over Satan, death & hell, and is implementing that victory by the deliverance of his redeemed people & judgement of his enemies. Jesus has the crown, the white horse, & until he returns he implements his victory in time by saving sinners, translating them into his kingdom.
The opened seals reveal the plan of campaign - the judgement of his enemies to be put into action, as John sees further visions.
Back to the beginning of Rev. we see that the events must shortly come to pass; ..... for the time is at hand. If we allow Jesus to mean what he says, the events are to take place within the lifetime of John & his readers, not thousands of years away. Jesus prophesied the destruction of Jerusalem & the temple in Luke 21 - the Olivet prophecy. That is not recorded in Acts, but must take place before what Jesus repeated calls this generation passes.
Revelation was therefore written before AD 70, & is concerned with the judgement of the Jews who rejected him, & the Apostolic Gospel. Note Ezekiel prophesies:
14:21 For thus saith the Lord God; How much more when I send my four sore judgments upon Jerusalem, the sword, and the famine, and the noisome beast, and the pestilence, to cut off from it man and beast?
22 Yet, behold, therein shall be left a remnant that shall be brought forth, both sons and daughters: behold, they shall come forth unto you, and ye shall see their way and their doings: and ye shall be comforted concerning the evil that I have brought upon Jerusalem, even concerning all that I have brought upon it. 23 And they shall comfort you, when ye see their ways and their doings: and ye shall know that I have not done without cause all that I have done in it, saith the Lord God.
Jesus warns the Jewish Christians of the signs before the destruction - history records that they did escape the city. Rev. 7 shows the faithful Jews sealed before the destruction - the firstfruits.
Ultimately all wicked & wickedness will be removed from the Kingdom, but in this age of grace, the wicked - tares - are allowed to live - but harvest is coming. (Rev. 14)