YSK: If you're forced to use Microsoft 365 for whatever reason you can at-least get a cheaper plan that doesn't include the AI features

Personally I would suggest migrating away from Microsoft 365 by using Libreoffice and Thunerbird or SeaMonkey or your favorite email client rather than giving Microsoft any money. However if for some reason you're absolutely 100% locked-in with Microsoft Office 365 then the linked instructions will at-least save you a little money hopefully. I would still recommend trying to find a solution to why you're locked in as soon as possible because I'm not sure how long this will last.