"Don't Screw This Up."

[Emanick]

But it's also possible that the Dark One wasn't telling him to keep fighting for the gates. It's possible that he was telling him "Now that we've got a stable goblin homeland, which was the ultimate goal all along, the plan's changed. Don't screw it up by continuing with the original plan."

The ambiguity is what makes it great.

I too thought that the ambiguity was great (I disagree with Peelee that TDO’s intent was clear), but unfortunately The Giant clarified in the book’s commentary that Redcloak’s god was indeed trying to get him to not screw up the original Plan by making sure he stays focused on the Gates.

It’s one of the only things Rich has said that I’ve thought makes the story less, rather than more, interesting - keeping TDO’s true position opaque would have been fascinating, and indeed it was (to me) until it was clarified.