Here are the steps on how to shutdown or delete project from Google Cloud Console.

1) Open Browser and go to to console.cloud.google.com
2) Select the project (from drop-down on top nav-bar)

3) Select Settings and Utilities icon (from hamburger menu on top-left nav-bar)

4) Click SHUT DOWN button.

5) Enter text Project ID and click on SHUT DOWN button to confirm project shutdown.

When you shut down a project, the following actions happens immediately.

• All billing and traffic serving stops.
• You lose access to the project.
• The owners of the project will be notified and can stop the deletion within 30 days via email (registered in the account)
• The project will be scheduled to be deleted after 30 days. However, some resources may be deleted much earlier.

Reference

• How to delete a project from Google Cloud Console
• Deleting an Instance
• Create, shut down, and restore projects
• How do I delete my Google Cloud Platform Account
• Deleting deployments