Hey there!
Sorry for the delay, here’s a link to an article that discusses common membership questions.
The short is: At any time when you cancel your account, we maintain your account and projects unless you request for an account deletion. If you have projects marked “Private”, they will become read-only and will stay private unless you mark them public. Only after marked public will you be able to edit the project but note, a project marked public can’t be marked private again until you are a paying member once again.