Increasing battery life of xperia z3 compact topic

Hello,
I have a new Xperia Z3 Compact.
I have bought it 7 - 8 days ago.
OS: 4.4.4 (23.0.A.93)

- Network was adjusted as 3G/2G in % 50 of total period, and next % 50 period only 2G
- Stamina mode was always active
- Autosynch: Off
- Brightness: Auto (about % 20 setting)

- Below is my screenshots.
- They say that this is not enought for a Z3 compact.

- So please what is your advice for improving my battery life.

Thanks

Attached Thumbnails