I tried to delete the Teams account, but it said I also had to delete the Personal account after having manually moved all my stuff into a third account - and then upgrade the new (third) account to Professional. And you have to do all that stuff manually - and there are thousands of documents.
And yes - I contacted support about it - and that was how they told me to do it. (They are also on another case of mine - that the Teams account does not work properly on neither of my Macs - only the iOS devices. It does not do tasks and the Home has disappeared when I use a browser. (I use a MacMini M1 and a MacBook Air M1 with the latest Public Beta of the MacOS)... I have removed Evernote, restarted the devices several times, installed Evernote again - but no luck.
So, well... Downloading everything as PDF's just to be sure I don't lose anything.. It takes days doing it manually...