Please help me aternos team!

So recently me and my friend conduit set up an aternos server with KitPVP And skyblock, and yestrday i was setting the server plugin files, but, after i started the server, me and my friend and a our admin called "I_Like_Trucks" joined as well to help, after about 23min, the server got shut down! so i decided to start it back, but all plugins were gone, expect a plugin i never added called "Archon Crates 1.9.1.3.jar" and server version was first 1.8.9, but when this plugin got updated, the server version got updated somehow to 1.12.2, i don't know how this happened, but please aternos team bring back my world, my server, or else we both are giving up, i hope you reply aternos........