The NFC South side, who sit second in their division, have taken just one win so far this season.
The quarterback told the team's official website: "For me, I feel I have to be more consistent. Whether it's the obvious [things] or just something like carrying out my fake or just putting the ball a little bit more out in front of the receiver.
"When I go back and look at the [Cardinals] game, even though it wasn't the best play in the world, I feel as though [offensive coordinator Mike] Shula has enough faith in me to know if the play is not there to throw it away. I didn't, and it showed.
"I just have to hone in on my skills and say, 'Let me focus more in the second half and get the job done'. It's very vital. If we are going to make this next step, I have to step up my game in the second half."
The Panthers play the Minnesota Vikings this Sunday.