There are 2 ways to do this.
1. Change default world to the world you added (Isn't the best option for multiple worlds)
2. Install Multiverse, you do not need the addons if you don't want them, this plugin adds multi-world support. But make sure you do /mv import (world name) normal
Arctic, its me Braydstrike..... ive known you for almost 2 years. We would play minecraft all the time and i would be mod or admin or co owner on most of your servers. I was wondering if you would wanna talk again and stuff... aloooooot has change about me and i can explain all of that on discord.
Sadly if you dont have your world saved on your computer, you cant revert back the server.
Sorry this happened to you, but please be more careful with staff by; using permissions instead of /op, possibly applications, etc.
Again sorry this happened to you.