The psalmist called on all people to applaud Yahweh joyfully because He is the great universal sovereign enthroned on high. This is a call to willing submission to His authority. [source][source][source]
"Kings in the ancient Near East loved to designate themselves by this title [1] because with it were associated superiority, suzerainty, and the power to grant vassal treaties (cf. 2 Kings 18:19; Isaiah 36:4). Any king assuming this title could not tolerate competition. So it is with Yahweh. He alone is the Great King over all the earth (cf. Malachi 1:11; Malachi 1:14)!" [2][source]