Hello Tesa,
Thank you for posting on Microsoft Community. I will do my best to help you on this situation.
Based on the issue you are having, before we are moving forward, may I know if the account that you lost access to OneDrive and Word program, is it a personal account (outlook.com, hotmail.com, gmail.com) or an account that is given by your school with a custom domain email address (for example: user@*schoolname.com)?*This will help narrowing down your type of account and allow me to provide the correct advice and solution.
Best regards,
Nero-TR - MSFT | Microsoft Community Support Specialist.