Cow

So my world default is set to another world on my server, other then my main one and idk how to set it back to the one I was playing on. I tried using a command block to try to set me and the players that joined to my original world but that didnt work bc idk that command for sending people to another world on the server. Command that I used /tp @a world(name of the world i want me and other ppl to play on). Thanks you for reading this. Ip:xSaberx.minehut.gg