How did the Shang Dynasty decline?

Here are some reasons:
In late Shang, slave owners and nobles were sybaritic, wallowing in luxury and pleasure. Last empeor of Shang Dynasty is one of the most representative tyrant in Chinese history.
Thr warfare against the tribes in Southwest China lasted a long time and charpen the social conflicts.
The ruler would like cruel torures and many official and nobles's defection made Shang surrounded by enemy frl all quaters. Zhou is uprising and Shanghai will be replaced.