Minecraft wiki entry for Things_not_to_do, associated text: If the player is trapped in the Nether, they can also kill themselves to respawn in the Overworld (provided they don't have a Respawn Anchor with too many charges left). It is advised that players place their items in a chest if possible first. The player can return to the Nether (hopefully with a flint and steel this time) to retrieve their items. The player loses experience by doing this.