Revelation records praises and rejoicing for God and the Lamb and for what God and the Lamb do. We believers join the heavenly praising now. In eternity the entire new creation will praise God and the Lamb.
Revelation 19, after many judgements (with a few more to come in Rev. 20), begins “I heard as it were a loud voice of a great multitude in heaven, saying, Hallelujah! The salvation and the glory and the power are of our God.” The judgments clear out the old creation. The salvation brings God into us so that the glory may be to Him now and in New Jerusalem.
Revelation 19:4: “And the twenty-four elders and the four living creatures fell down and worshipped God, who sits upon the throne, saying, Amen, Hallelujah!”
Revelation 19:5-6: “And a voice came out from the throne, saying, Praise our God, all His slaves and those who fear Him, the small and the great. And I heard as it were the voice of a great multitude and like the sound of many waters and like the sound of mighty thunders, saying, Hallelujah! For the Lord our God the Almighty reigns.”
We are certainly included in the “all” in verse 5. Our praises should not be so quiet. We praise God today, and at the time of Revelation 19, and in New Jerusalem.