RobH_en_tn/isa/12/04.md

call upon his name

Here "his name" refers to Yahweh. Calling on him represents either praising him or asking him for help. Alternate translation: "praise him loudly" or "call to him to help you" (See: rc://en/ta/man/translate/figs-metonymy)

declare his deeds among the peoples

The noun "deeds" can be expressed with the phrase "what he has done." Alternate translation: "Tell the peoples about the great things he has done" (See: rc://en/ta/man/translate/figs-abstractnouns)

proclaim that his name is exalted

Here "his name" refers to Yahweh. Alternate translation: "proclaim that he is exalted" or "proclaim that he is great" (See: rc://en/ta/man/translate/figs-metonymy)