You should read & study virtues everyday.
Learn how to distinghuish virtues from vices and understand that each virtue also can become a vice when used with incompetents, but virtues indeed remain virtues when used with excellence.
How to develop a higher moral?
You need; practical skills, wisdom, virtue, goodness, goodwill towards the audience and no direct interest in the outcome of debate. Justice is a very important aspect of Morality, basically if you fuse Morality with Justice you get Retribution. Retribution is morally-correct, but certainly not oppressive.
It's very good to study;
Morality, Virtues, Logics, Argumentation study, Justice, Retribution, Human Rights.