How to end a paid plan
Write to [email protected] from the address the plan was agreed with. The end date and the last invoice are settled in that reply.
What happens to your projects
Nothing is deleted unless you ask for it. You can still download every file as a ZIP, and you can stay on the free Sketch plan for one project.
Deleting projects yourself
Delete removes a project's record, every revision and its files from the server at once. There is no undo, so keep the ZIP if you might need it.