The Servant Song is bracketed by exaltation language. It opens at Isaiah 52:13: "Behold, my servant shall deal prudently, he shall be exalted and extolled, and be very high." It closes at Isaiah 53:10–12 with a sequence the text refuses to make coherent without resurrection:
"When thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand. He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities. Therefore will I divide him a portion with the great, and he shall divide the spoil with the strong; because he hath poured out his soul unto death." (Isa 53:10–12)
Trace the sequence: the Servant pours out his soul unto death → the LORD makes his soul an offering for sin → the Servant sees his seed → the Servant prolongs his days → the Servant sees of the travail of his soul and is satisfied → the Servant divides the spoil.
A Servant who dies, then sees his offspring, prolongs his days after death, justifies many by his knowledge, and divides the spoil with the strong is not a corporate Israel and is not a tragic martyr. The only coherent reading of Isaiah 53:10–12 is death followed by life and reign. John Owen, in his exposition of Hebrews 2 (PD), names the chapter as "the proof-text of the resurrection, written by an Old Testament prophet."
The NT confirms the trajectory. Acts 2:27–32 — Peter reads Psalm 16 ("thou wilt not leave my soul in hell") as resurrection prophecy of David's greater Son. Isaiah 53 sits in the same canonical register.