Windows 10: My world in minecraft was dissapeared :

Hello, today i updated minecraft to 1.16.1 and play on my original world, but later i go back to 1.15.2 and all my bieldings, blocks, city, house, was dissapeared. I have only some redstone in inventory and all. When i find a place of my city, i saw only grass. I played on this world since 2019.01 and when i 5 hours try to find some info, i saw only nothing will help you, start again. My age is 16, we played with my friends and brothers here, and i start crying. More than 2 yrs was dissapeared in one second I try to find smth on files of minecraft, and i find a data of my world. data of this world was perfect. World size 516 mb, 7 days ago was 489mb so all my bieldings was dissapeared but i known that they in my world data. How can i see my world? Name of world on russian.

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Missing world is in my folders but not in Minecraft W10 world list.

I have this one world on minecraft windows 10 editon that disappeared from my world list when my laptop froze and restarted. Upon going back on minecraft, the world disappeared. I've looked in the worlds folder and its still there, but its not on the world
list. What should I do to get it back on the worlds list? PLEASE make sure your answer deals with Minecraft WINDOWS 10 EDITION and not the JAVA EDITION please.

 

Minecraft worlds won't show up on the world list.

So when my laptop crashed while I was playing minecraft, the world disappeared. There was another question on here stating the same thing and one of the replys showed how to get it back. I went on the minecraft worlds folder and it was there but it never
showed up on the list on the actual game. I went back on minecraft and ALL my worlds were missing from the list! So my question is, How do I get them back to showing on the game?

 

Minecraft Windows 10 Edition Lost Worlds