What is Nietzsche's proposed alternative to morality? How does it improve upon both the Noble and the Slave moralities?

It improved upon the noble and slave morality because Nietzche explained that there is a conflict between slave and master morality.

Explanation:

Master - slave morality is the main theme of Friedrich Nietzsche's works in his book titled "On the Genealogy of Morality". Nietzsche argued that morality is made up of two types which are master morality" and "slave morality". He explained that master morality adores pride and power, but slave morality values sympathy kindness, empathy.

It improved upon the noble and slave morality because Nietzche explained that there is a conflict between slave and master morality no matter who we are. For Nietzsche, morality and culture and related. The laws, languages and traits, has to do with our mindset and society.