Again, this idea of YHWH 'becoming king' anew is a biblical one.
Some older commentaries on Rev. 11:17:
Pulpit
Because thou hast taken to thee thy great power, and hast reigned; because thou hast taken thy great power, and didst reign (Revised Version). God never ceased to reign, though for a time he abrogated his power. This power he has now reassumed, and the elders thank him for it, for it is the assurance of the end of the suffering of the Church of God.
Gill's Exposition
because thou hast taken to thee thy great power, and hast reigned; power always belonged to him, as God; he always was the mighty God, and, as such, help for his people was laid upon him, he being mighty to save, and able to bear the government of them, laid on his shoulders; and, as Mediator, all power in heaven, and in earth, was given to him at his resurrection; and he had a name given him above every name, when exalted at the right hand of God, and was made, or declared, Lord and Christ; and from that time he has, in some measure, exerted his power and reigned: he endued his apostles with power from on high; and he went forth in the ministry of the Gospel conquering, and to conquer; and has ever since reigned in the hearts of his people; but now he will manifest and display his "great" power; he will show it more openly, and use it more extensively; his kingdom shall be from sea to sea, and from the river to the ends of the earth; he shall be King over all the earth; his power has been seen in ages past, but now the "greatness" of his power will be made manifest; he has always had a kingdom on earth, but now the, "greatness" of the kingdom, under the whole heaven, will be his.
Barnes
Because thou hast taken to thee thy great power - To wit, by setting up thy kingdom over all the earth. Before that it seemed as if he had relaxed that power, or had given the power to others. Satan had reigned on the earth. Disorder, anarchy, sin, rebellion, had prevailed. It seemed as if God had let the reins of government fall from his hand. Now he came forth as if to resume the dominion over the world, and to take the scepter into his own hand, and to exert his great power in keeping the nations in subjection. The setting up of his kingdom all over the world, and causing his laws everywhere to be obeyed, will be among the highest demonstrations of divine power. Nothing can accomplish this but the power of God; when that power is exerted nothing can prevent its accomplishment.
And hast reigned - Prof. Stuart, “and shown thyself as king” - that is, “hast become king, or acted as a king.” The idea is, that he had now vindicated his regal power (Robinson, Lexicon) - that is, he had now set up his kingdom on the earth, and had truly begun to reign. One of the characteristics of the millennium - and indeed the main characteristic will be that God will be everywhere obeyed; for when that occurs all will be consummated that properly enters into the idea of the millennial kingdom.