The sticker on the driver side says 29psi and I set my tire pressure at 29-30PSI usually. However, I see more wears on the side (both sholder wear).
Should I put more air then recomended(29PSI)?
if so how much?
Thanks.

check your tire and your will find MAX psi specified.
Just don’t go beyond that. Usually upto 35 is ok. I think…

Usually, optimum tire pressure can be somewhere between 30-32 psi. But, it can be varied denending on the weather. So, I set my tire pressure at 32psi (as specifed in the manual) and check them every six months.

If you put more air, it can save GAS.
But it will reduce contact surface between tire and road which is critical for brake.
Previously, I put 10% more than driver side tag, but I’m puting just as it is now.
It’s up to your decision.