If you have a backup of the world, go ahead and restore it. The backup folder is available in the normal world selection. Simply select the world backup you lost and you will be able to bring it back.
Unfortunately, if you haven’t created a backup copy, that world is gone forever and there’s no way to restore it.
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How to restore a deleted world on PC
Restoring a deleted Minecraft world is only possible if you have backed up your saved games (for example, via File History and automatic backups on your PC Microsoft Windows). This is because when Minecraft deletes a file, it does so permanently, bypassing the trash.
How to recover a deleted Minecraft world
To make sure you can easily recover your Minecraft worlds, make sure you back up your worlds. In Bedrock Edition, select the pencil edit button next to the world in the main menu. Go to Game and scroll down to Copy World. This will ensure that you can always go back to that copied version if your original file becomes damaged or deleted. For Java Edition, simply copy the folder for the world to your PC or drive.
If you haven’t created a backup version of your Minecraft world, things are much more complicated. Worlds are stored locally on your device, so if you delete them from your console or PC, they can be difficult to recover. If you are on PC, you can try the following process:
How to restore a deleted Minecraft World on a Windows PC
Doing this on PC is super easy, more than you would have could think, and that’s a good thing. But as we stated above, you need to make sure that your game is backed up before you go any further, otherwise you will just waste your time. Follow these steps:
What to do when your Minecraft world is deleted
One of the problems with this particular question is that over the last nine years Minecraft has gone through countless versions and spins- off, and the original build-focused version of the game ported to every hardware platform that couldn’t run fast enough.
Trying to get an answer from the internet to even a seemingly simple Minecraft question can mean wading through years of outdated, irrelevant, or counterintuitive information.