Never double down.
Never post.
Luck is unequally distributed.
Huster's First Law is not applicable if you simply never get into a mess anyway.
This is the most-often-ignored of Huster's Laws.
Some people are preternaturally disposed to good luck and are somehow always able to snatch victory from the jaws of defeat.
Commentary on Huster's First Law
Doubling down never succeeds. It only further immerses you in whatever mess you've gotten yourself into. You cannot dig your way out of a hole. Simply admit defeat, take the L, and move on.