This happened a while back in December of 2020, I was playing in my Minecraft creative world and my desktop computer at the time was plugged into an outlet that was controlled by a light switch at the time. When I asked my sister to turn my room light off she pressed the wrong switch on accident (the switch controlling my computer at the time was right next to my room light switch) My computer shut down and when I loaded the game  back up I was unable to join my world. Now all I can see when I try to join my world is a message saying "there was a problem loading this world" 

Don't know if you'll see this but I worked really hard on that world for months and I've been looking for ways to get it back for a while now and this is the last thing I can think of.

Thank you.