None of the more popular cloud storage providers have a way to migrate from one to the other. You either need to download the files from one and upload them to another, or use a third-party service such as mover.io to do the transfer for you.
You can follow the download and upload method to perform this migration process or you can go for any automated software. I suggest you, try CubexSoft OneDrive Migration Tool. You can download it for free from its official page.
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