If all you did was hide a folder [in File explorer] then all you have to do is unhide that folder. Judging by your description, you have not changed your user account itself i.e. it is a folder that is hidden not the user account.
Open File explorer,
in the upper-right, click on the dropdown arrow if necessary so that the ribbon is visible,
click on the View menu,
set the checkbox for Hidden items,
navigate to the folder concerned & clear its hidden property,
[optionally] clear the checkbox for Hidden items.
Try*3 - a user Dell Inspirons 7779, 1545, 9300; Windows 10 Home x64 & Pro x86; Office Pro 2007; HP DJ2540; HTC UPlay [Android 6.0], MyPhoneExplorer
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