The Chelsea defender helped the Three Lions to secure their place at the 2014 World Cup on Tuesday with a 2-0 victory over Poland.
Roy Hodgson's side booked their tickets to Brazil as winners of Group H - netting 31 goals in 10 matches and conceding just four.
Cahill, who has formed a solid centre-half partnership with Everton's Phil Jagielka, feels England should now be looking to the future with renewed optimism.
On their match-winning capabilities, he said: "If you look through the starting line-up, there were certainly players who can turn a game, which is encouraging for us.
"We have been more attacking and created a lot more chances over the last couple of games. First and foremost we look to defend and then furnish the lads who can create things with the ball. They've done it over the last two games.
"Wayne Rooney was great against Poland. Andros Townsend again had a big impact. They created chances. If we keep it tight, it gives them the licence to go and create."
On shutting sides out and looking towards a shot at global glory next summer, he added: "We've done the hard work and now I can look forward to Brazil, especially if I am fortunate enough to go.
"In the last four games we've had three clean sheets. We're improving and know each other's game a lot better now.
"Against Poland we had to dig in, keep it tight and defend to let the more creative lads produce chances.
"There is still a lot of hard work to do, but it is all looking encouraging for us."