Jamie Roberts says Wales' World Cup campaign has left them with the belief they can compete on the global stage.
The centre helped Wales finish fourth after losing the bronze play-off to Australia.
"We will go away with a feeling we can compete with the best in world rugby," Roberts said.
"That is a mindset to take into the match against Australia in December, the forthcoming Six Nations, the tour to Australia next summer and the next couple of years."
However, the Cardiff Blue and British and Irish Lion admits Wales must cut out the sort of mistakes that undermined their performance against the Wallabies.
"If we get things right we will put teams like this [Australia] away.
"We made too many simple errors and, at this level, errors like that will lose you games. There are no excuses.
"We haven't beaten a southern hemisphere team down here, so that is the disappointing thing. Our next opportunity to do that comes next summer.
"To go from the elation of that Ireland [quarter-final] victory to events of the last two weeks has been emotionally very tough but that is the fine line at this level.
"We need to take it on the chin and move forward.
"To lose to South Africa by a point, France by a point and Australia by three, it just goes to show the fine lines at this level.
"Yes, we would have preferred to be playing on Sunday [in the final] but, when you pull on the Welsh shirt at Eden Park, there is no doubt our boys were up for that game.
"We went in at half-time 7-3 down but we were obviously still in the game. We clawed our way back, but we missed a few crucial kicks at goal.
"It's such fine lines at this level - one pass here, one kick there, a missed tackle here. Little moments in games count.
"I remember the 2009 Lions [they lost the Test series to South Africa 2-1] and I remember a semi-final of the Heineken Cup a few years ago with the Blues that went to a penalty shoot-out.
"These last two weeks have been pretty brutal. It's a rollercoaster of emotions."