If you download the files of the world from the servers file manager you could probably re upload that to the settings, Re uploading the world???
Im not sure if it would help, but a really good start is to first remove the mods and plugins, and just get the world itself working then add the plugins back one by one, then the mods one by one. If the server stops working only when you add back a mod/plugin then it is probably that mod/plugin that is the issue.