URGENT-World Gone

I had a world I had spent some time on before have a message that displayed the phrase:
“There was an error loading this world” and not let me back in, ever. This has happened again, in this survival world I had spent SO. MANY. HOURS. playing the game, I even had full netherite enchanted gear. Please fix this, or I will never play your buggy game again. I realize this may seem like an overreaction, but I have wasted so much time of my life, for all of my work to be erased. What is the point of getting so invested in a game, if all of my progress will be gone?