As per title.

ATM2 is a good tyre, but the tread wears out quickly. I only use it for 2 years and 24000km, the tread is almost gone now. Looking for better alternative.

Did you do tire rotation every 15k or 20k km?

Yup, all tyres wear out evenly.

Surprising then that they only lasted 24k km What car do you drive and you drive aggressively, do you? I personally now use Maxxis Victra I-Pro for this size and I find it best value for money but the tread wear rating is even lower than ATM2. This Maxxis is performance tires while the ATM2 is touring tires. So if durability is your main priority, I am not sure if the Maxxis will last longer but performance wise it is better than ATM2 (I've used ATM2 as well for a short time).

tread pattern is shallow since new. i tahan until 34k becos diy rotate with spare tyre (total 5 wheels)
or else botak before 30k

lifespan is about 2year plus

Doesn't look shallow to me when I use it.