My friend added a data pack it it deleted my hundreds of hours of work

[DolphinGaming4]

My friend was adding a data-pack to our world and reset every thing! I am so pissed I spent hour and hours working on that world! Is their any way of getting it back? I am desperate 

[DolphinGaming4]

He did not press reset, but I tried the /worlds thing and it dose not work.

[_Tarna_]

Did adding the datapack reset everything or did your friend reset everything by pressing reset? If it looked like your world has been reset, you may just be in a different world. Do /worlds to see if you are just in a different world. Then /world <world> to teleport to it. This can happen if you change the default world of your server to a name of a world that is not on the server. But if your friend pressed reset on the panel, then there is no way to get it back to how it was before if you do not have your own download of the world.