I participated in an pvp event. I was the last person left, but then realized I could not get back to the actual world. I cannot use /warp /home /spawn /pe /tell .... How do I get back to the original world?

You've been jailed in a WORLD.

try /kill :3 or search for holes in the protection to warp away... find a way to kill yourself, maybe climb on a tree and jump several times xD

/kill does not work. and I am having a difficult time finding a place that I can kill myself. I am trapped in an arena with apparently no way out.

<edited> lol, found a way. Thanks for the help

Ahaa...