The home side have seized a 2-0 lead after wins at Trent Bridge and Lord's, with the third Test beginning at Old Trafford on August 1.
Trott has managed decent first-innings scores of 48 at Trent Bridge and 58 at Lord's, but has lost his wicket for a duck in each second innings.
Bell has made a century in each match so far, while Root produced a match-defining knock of 180 as England emphatically won the second Test.
However Trott also feels in good nick, and when asked if his best was still to come this series, he said: "I hope so. I've felt good, actually.
"Sometimes you score runs and you're not feeling at the top of your game. I feel like I'm playing pretty well and it's been nice to get a couple of good partnerships, like with Belly at Lord's in a tricky situation, I suppose, at 28 for three.
"We put on 99 and he went on and got the big score that I would have liked. But there are still three games left and personally it would be nice to contribute in a similar way.
"Anybody can get out quite early in their innings, I suppose.
"You haven't contributed for the team but, if you get 50, at least you have done something towards the team effort - although on a personal note it is pretty upsetting because you have done all the hard work and you're feeling pretty good.
"It's frustrating but I feel in the past that I have contributed and the side has been successful. Other people like Joe and Ian have stepped in, perhaps it is my turn for the rest of the series."
The DRS system has been under the spotlight, especially after the Trent Bridge Test in which Australia believed Stuart Broad should have been given out but had to stand by and watch as they had used up their allocation of reviews and the England bowler refused to walk.
Trott is philosophical about his own DRS dismissal during that game, even though it saw him leaving the field without troubling the scorers.
"Things go full circle and come back to you. I've played enough cricket to realise that and it's important not to focus on that too much and move on," Trott said.
"I wasn't happy, I wasn't walking off smiling and clapping my hands. But it's such a long series that things like that are probably going to happen and unfortunately it happened to me."