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You may also try manually copying the User folder. The easiest approach is to sign into the account you want to keep, since you'll need to be an administrator to move files between accounts. Then open File Explorer and go to This PC, then Local Disk C, then Users, and you should see a folder for the old account. Open it, and you'll find folders like Desktop, Documents, Downloads, and Pictures. You can copy whatever you need from those into the matching folders under your new account, which will also be in the Users folder under your new account name.
If Windows won't let you open the old account's folder because of a permissions error, right-click the folder, choose Properties, go to the Security tab, click Advanced, and change the owner to your current account, then apply it to all subfolders. That should unlock it so you can copy freely.
Once you've copied everything over and double-checked it's all there, you can delete the old account. Go to Settings, then Accounts, then Other users, click on the account you want to remove, and choose Remove. Windows will ask if you want to delete the account's files too since you've already copied what you need. If you're not sure you got everything, there's also an option to keep the files, which will save them in a folder on the desktop just in case, and you can delete that folder later once you've confirmed everything transferred fine.