The Poland international was axed by Gunners manager Arsene Wenger in March following a series of errors, but has since become first choice again at the Emirates Stadium.
"Looking back now it was a good lesson for me, one that I needed at the time," Szczesny told reporters. "I definitely have got sharper since then, I have worked harder in training and it worked back then for me and I have carried on doing it.
"I am feeling like I am a bit more consistent at the moment. I am trying to do the same thing all over again and it seems to be getting the best out of me. We are winning and that is the most important thing. I am getting to the point in my career where all I care about is the team and if the team wins I am happy.
"I would have preferred a few more clean sheets, but I'm just delighted with the team's form and how we have been playing and getting the results."
Arsenal are reportedly preparing to offer the 23-year-old, who has kept four clean sheets in 12 appearances this term, an extension to his current contract, which expires in 2015.