Eddie Jones believes England demonstrated they are heading in the right direction following the gutsy series victory over Australia.
Jones' side added to their tour triumph in 2016 by making it back-to-back series wins Down Under, beating the Wallabies 21-17 in the deciding Test on Saturday.
The tourists fell behind in the series after going down 30-28 in Perth, but levelled up by prevailing 25-17 in Brisbane last weekend.
They made a slow start to the third Test, falling 10-3 behind after Tom Wright crossed for the hosts. Yet England recovered as Freddie Steward and Marcus Smith went over to turn the contest firmly in their favour at 21-10, and they stood firm after Folau Fainga'a powered over later on.
It meant England lifted the Ella-Mobbs Trophy, justifying the backing from Jones. Despite a disappointing Six Nations campaign, Jones maintained a constant view that his team were making significant advances, which he feels has been justified by this series victory.
The head coach hopes the progress will continue as the 2023 World Cup in France edges closer, with his side aiming to go one better after losing 32-12 to South Africa in the 2019 final.
"We weren't at our best in this Test, but we kept fighting, and we kept in the game – particularly the defence of our finishers at the end was outstanding – and that got us the result," Jones told Sky Sports.
"We were just a little bit off, but we kept fighting, and it was a great effort by the leaders. It's a really positive step. We've always felt the team is going in the right direction. Sometimes, the results don't reflect that.
"At the end of the game, we had six players with under 10 caps, so it is an inexperienced squad who will really benefit from an experience like this.
"They understand how hard they have to fight to win a Test match away from home. Some of our guys have now won two series away in Australia. I am so proud of their efforts.
"We are in a good position. We have just got to slowly, slowly keep improving. We want to be at our best by next October."