The last verse would disqualify Israel from being the servant since it speaks of gathering Jacob again to Him. Israel is Jacob
Here is what Jewish Bible says:
1. Hearken, you islands, to me, and listen closely, you nations, from afar; the Lord called me from the womb, from the innards of my mother He mentioned my name. א. 2. And He made my mouth like a sharp sword, He concealed me in the shadow of His hand; and He made me into a polished arrow, He hid me in His quiver. ב. 3. And He said to me, "You are My servant, Israel, about whom I will boast." ג. 4. And I said, "I toiled in vain, I consumed my strength for nought and vanity." Yet surely my right is with the Lord, and my deed is with my God. ד. 5. And now, the Lord, Who formed me from the womb as a servant to Him, said to bring Jacob back to Him, and Israel shall be gathered to Him, and I will be honored in the eyes of the Lord, and my God was my strength. ה. 6. And He said, "It is too light for you to be My servant, to establish the tribes of Jacob and to bring back the besieged of Israel, but I will make you a light of nations, so that My salvation shall be until the end of the earth."
It is clear that he is not speaking to Jacob but to someone else who is his servant, whom he calls Israel (verse 3).
Personally, I think Isaiah was in a "trance" like so many other biblical authors amdit, or positively insane, and people have bene trying for thousands of years to make sense of his inanity.
“Thank you agian for your labor”
As I have said before, it is not “labor” when corresponding with you; it is enjoyment and a learning experience.
I don’t think Isaiah was insane. He was a prophet who was entrusted with a “word” that had many prophetic layers.
2 Pet.1:21, “For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.” (1 Pet. 1:10-12 “Of which salvation the prophets have enquired and searched diligently, who prophesied of the grace that should come unto you: Searching what, or what manner of time the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow. Unto whom it was revealed, that not unto themselves, but unto us they did minister the things, which are now reported unto you by them that have preached the gospel unto you with the Holy Ghost sent down from heaven; which things the angels desire to look into.”
He was writing for his times but look at the times he was in and the rulers he served under. They were just as chaotic as our own time.