What could a gladiator do to prevent his death

First of all, Gladiators can be animals, men and women, So they are not all male. Second, He could plead with the emperor to live.

Hollywood portrays Roman gladiatorial contests as brutal, unruly duels that ended when one of the combatants killed the other. But in reality, gladiators didn’t always fight to the death. These ancient Roman athletes were highly trained professionals who made their living fighting, not dying. And since gladiators were expensive to prepare and maintain, killing off mass numbers of them would have been a bad business decision for the lanistae who owned and trained them. Occasionally, sponsors would pay extra to stage a fight to the death, compensating the lanista for any lost gladiators. But more commonly, gladiatorial bouts simply had to have a decisive outcome, meaning that one of the contestants was wounded or his endurance gave out.