So you're talking about the Christian compromise with secular society (including the need to work to save ourselves, given God's apparent absence or indifference), a compromise that started with the religion's Romanization, which made for the canonization or forging of texts like those and for the exclusion of Gnostic or more radical Jewish ones.

Work opportunities are prepared by God? Does that include the work done by the Roman Empire in destroying Jerusalem and crucifying Jesus? Did God change his mind about condemning us to labour by ourselves outside Eden?

This Protestant compromise with capitalism you're presenting here is hardly in line with the skeptical, existential spirit of Ecclesiastes, by the way. That chapter goes on to say, " As for humans, God tests them so that they may see that they are like the animals. Surely the fate of human beings is like that of the animals; the same fate awaits them both: As one dies, so dies the other. All have the same breath; humans have no advantage over animals. Everything is meaningless...So I saw that there is nothing better for a person than to enjoy their work, because that is their lot."

So the satisfaction taken in work is an absurdist consolation, in Ecclesiastes, because God is inhuman. And that's where the bulk of Judaism ends up, in contrast to Christianity, which personified God in the Roman manner.