Owen Farrell says England still have some work to do if they are to replace New Zealand as rugby union's dominant force.
England are now positioned second in the global rankings following their 3-0 whitewash of Australia - they were eighth when Eddie Jones took over in December - and have extended their winning run to 10 Tests, four short of the record set under Sir Clive Woodward.
Toppling New Zealand remains the main objective, though, and Farrell knows they must continue to develop if they are to challenge the world champions.
"What we've done is a step in the right direction, but we have to back it up and keep improving because we're not where we want to be," Farrell said.
"It's been brilliant. We'll enjoy this because it has never been done before. We're in a good place but our goal is clearly to be the best, that's what's been said since we met up. That's what we're working towards.
"To beat New Zealand we'll probably have to start joining things up a little bit more.
"We've had games in this series where if one thing's going well something else might not be. It might then swap around for the next Test.
"There might be times we put little bits together, but there aren't big patches of that yet so it's about how we do that.
"We'll definitely go back and look at the series as a whole and make sure we learn from it.
"We're not where we want to be yet although we've come here and got a brilliant three results. The only thing we can do is to get better."
Farrell amassed 24 points in Saturday's 44-40 third-Test victory over the Wallabies in Sydney through six penalties and three conversions and missed just one of his 10 shots at goal, finishing the series with a 66-point haul and 88 per cent strike rate.
And the Saracens star has revealed that coaching sessions with Jonny Wilkinson at the squad's Surrey training base have elevated his game to a new level.
"Working with Jonny has impacted on me massively. He's made me understand a lot better what I do and how I get to where I want to get to. He's the best ever," Farrell said.
"I can't see anybody ever being better than him, either. He's a good person to learn from. He's someone who knows it all inside out.
"He's someone who's thought a lot about it. Not only that, but he's a brilliant person to learn off.
"If it doesn't go in one way he's got 10 different ways of telling you how to do it. It's brilliant for the likes of George Ford and myself."