My entire world has gone

I had a survival world named “Copy of Asznee” which was almost a megabite big. I put hours and hours into that world. I managed to accumulate a stack of diamond blocks, I made a massive farm, mine and I recently made a large castle and was making a village around it.

 

However, it recently disappeared from my world selection. I tried scrolling down further and even syncing my old worlds but I couldn’t find it. I know this may sound childish but I genuinely felt devastated when this happened. All of my hours of work into that world, gone in an instant.

 

I’m still unsure wether it’s a bug or not but if there is a way to restore it. It would be much appreciated.

 

Thanks for reading this  ( I have included Images of what I had made in that world )