The main focus of these hymns in Revelation points us to an eternity of praise to God. And in that space and place we will never grow weary of doing that. The steadfast love of the LORD never ceases; his mercies never come to an end; they are new every morning; great is your faithfulness (Lamentations 3:22-23). There will be a new cause for praise to God each new morning in heaven. and our focus will be fixed on God.
The hymn, Behold a Host Arrayed in White expresses beautifully the joy of singing the praises of the One who is worthy of all blessing and glory and wisdom and thanksgiving and honor and power and might forever and ever! Amen!