Sorry that you're facing trouble migrating your images from older Lightroom account to the new one.
Transferring images from one account to another in Lightroom is not possible. You'd need to use our freeLightroom Downloader to retrieve everything that is in the cloud under one Lightroom account.
You can then upload it all again under the new account. But please note that while the download folder contains xmp files with the adjustments, titles and captions, ratings and keywords, it doesn't contain the album or so-called "folder" structure.