Australia will use a reshaped spine against the Cook Islands in Townsville on Saturday night, with Reece Walsh returning to join Cameron Munster, Tom Dearden and Harry Grant.
Captain Isaah Yeo also returns at lock, as Australia prepares for a semi-final at Allianz Stadium on November 8.
Yeo said the team's depth had created opportunities, but settling combinations was important as the knockout rounds approached.
"This team (against Cook Islands) is something we feel like we can take forward and continue to grow," Yeo said when asked about the changeable spine.
Australia beat New Zealand 24-22 and Fiji 36-22, recovering from being behind in both matches.
"I'd rather be learning lessons while we win," Yeo said.
He identified contact and ruck control as areas for improvement, saying Australia should not let opponents put pressure on its forwards.
"You don't want to feel like teams can attack your front door so that is an area (to improve) ... just making sure the contact is a little bit better and the ruck control. If we get that right it will hold us in good stead."
Yeo said he remained confident Australia could improve, while cautioning that expectations of a perfect performance every game were unrealistic.
"There is an expectation for the Australian side that you are performing at a 10 out of 10 each game, but that is not the reality," he said.