File Clean-up and Organization

I am not a computer tech, simply a user.

I have a MESS in MS OneDrive. MS Tech Support has not helped.

I have recently moved to MS 365 for Non-Profits. I have at least 4 versions of OneDrive from migrating from one version of MS365 to another, with MS 365 for Non-Profits being the most recent and largest (at 79 GB and 28K files, 1,375 folders). The various versions of OneDrive have many duplicate folders and files (at least names.. some are more recent updates than others), some common folders, but the contents are not the same, and other similar headaches and nightmares to try to straighten out. 

I'm hoping to use Box as THE place to work. I'm considering copying all the content of my various OneDrives to Box, sorting them, and looking for duplicates or the most recent version of each. 

Does anyone have suggestions or recommendations to help me? Processes? Tools? Applications?