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 ....