Do not upgrade
You'll not be able to downgrade and you'll get charged. i explored notion 3 months ago, they gave me some credits to activate my plus plan which i did and then i wanted to cancel because i wasn't using notion at all.there is no plan downgrade button, i email them, they said i need to install their app to be able to downgrade. i installed the app, there's no plan downgrade option neither.3 months after, i just got charged now ,...straight robbery ....