How to downsize the vanity, in a person?

We live in a time when vanity is a major driver of human actions.

How can we define it?

Several sources converge in defining vanity as

self-complacency,
overconfidence in one’s abilities, and in attracting others.

With a close connection to narcissism.

The term vanity comes from the Latin vanus, which stands for vain, empty, useless, futile, without material consistency: more appearance than essence.

In short, to scale down or even destroy the concept of vanity in the eyes of a person it may be enough to go to the substance of its meaning and define it for what it is:

nothing!

Don’t you think so?

PS: The painting is Narcissus by Caravaggio.