Why was the Birth of Venus made?

There doesn’t seem to be any information about why it was commissioned.

Botticelli was commissioned to paint the work by the Medici family of Florence, specifically Lorenzo di Pierfrancesco de’ Medici under the influence of his cousin Lorenzo de’ Medici, close friend to Botticelli. Source(Botticelli)

As to its commission, the painting was solicited by a member of the Medici family, which is thought wanted to have a reproduction of an earlier work by a different artist, which had been lost after the rule of Nero. Source

if any art was good enough to have made it this far it was because they were commissioned pieces