Isaiah has no Zoroastrian influence. It was written well before Zoroastrianism had any influence on the middle east.
“Most if not all of the religions from that time period have apcalyptic literature.”
That’s incorrect. Have you read any religious books?
The Gathas aren’t apocalyptic, neither are the Upanishads, the teachings of the Mahavira, nor the Daoist writings.
“Isaiah has no Zoroastrian influence. It was written well before Zoroastrianism had any influence on the middle east.”
You are dead wrong.