Step one: Don't drop out of the race.
Step two: Don't be Rudy Giuliani.
Seriously, how can a guy who dropped his Senate campaign rather than face a likely loss to Hillary Clinton give anyone advice about how to beat Hillary Clinton? On the other hand, giving advice on subjects that he knows nothing about is Rudy's main shtick. For much of the Bush administration the guy sold himself as a foreign policy expert just because he happened to be the mayor of a city when it was attacked by international terrorists.
Step two: Don't be Rudy Giuliani.
Seriously, how can a guy who dropped his Senate campaign rather than face a likely loss to Hillary Clinton give anyone advice about how to beat Hillary Clinton? On the other hand, giving advice on subjects that he knows nothing about is Rudy's main shtick. For much of the Bush administration the guy sold himself as a foreign policy expert just because he happened to be the mayor of a city when it was attacked by international terrorists.