You can either wait for other people to find the corpse and cast a raise dead spell (it can take a while or never happen, specially if your toon have no acquaintances or allies) or, assuming you are in the Near Ethereal Plane map, walk towards a column of light (just go forwards until you see it and click it). There you can choose between resurrecting (losing some XP) or release as a ghost, which you can use to do some RP in order to guide someone to the place where the corpse lies.