Transfer ownership on a free personal account

I have a small Personal Free account for records storage for a group that I belong to. I need to transfer ownership to another person to maintain the file history of this organization after I fully retire and have someone else take over from me. I currently access the files through my personal email and password for posting the files to storage and share all the files for our group to access by listing the share code for them on our website. It is an online history for this small organization and keeps the paperwork requirements to a minimum.