Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
This is not the case for everyone. Many have confirmed that depending on your region or your plan, the downgrade is not available for everyone.
I initially thought that to be true and that it applied to me in Australia. I tried many suggestions and could find no offer to move to MS 365 Classic.
BUT.. when I found out where to cancel the automatic renewals (which is disappointingly hard to find) the option appeared.
That might work for you