"Don't Screw This Up."

[Peelee]

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.

Except Redcloak was already singularly focused on Gobbotopia at the expense of The Plan, so that meaning doesn't make sense. It only makes sense to remind Redcloak of The Plan, as a note to get his butt in gear after a year of sitting around effectively abandoning The Plan.

No ambiguity. Just "go after the Gate".