Death, especially in a Dragon Ball setting, is inevitable. When you die in a DE, or by other means, you are sent to be judged by King Enma on whether they get to go to Heaven or Hell. When you die, you need to wait one month to return to the living world by a conventional means or with more... abstract methods. The choice is yours by then.
The alternative means to escape the Afterlife can be up to you. More official methods include the following:
Being wished back via Dragon Balls
Completing 2 Afterlife Quests
Special temporary revivals for specific events or sagas
Most martial artists seem to have been given bodies when they die. Due to this phenomenon, the Rulers of Worlds, the quadrant Kais, have taken an increased interest in those who pass through Enma's Waystation. Special things may come to those who try their best while they live.