en_tn/isa/58/01.md

lift up your voice like a trumpet

This means shout loudly. Here "your" refers to Isaiah. (See: rc://en/ta/man/translate/figs-simile and rc://en/ta/man/translate/figs-you)

confront my people with their rebellion, and the house of Jacob with their sins

This is saying the same thing in two ways for emphasis. Here "my" refers to Yahweh. (See: rc://en/ta/man/translate/figs-parallelism)