You can make your Chromebook run like new again by doing a factory reset. If you will no longer be using your device, you may want to do a factory reset.

A factory reset erases all the information on your Chromebook’s hard drive, including all the files in the Downloads folder. Before you reset, make sure to back up your files on Google Drive or an external hard drive. The factory reset won’t delete any of your files on Google Drive or external storage device.

Here is more information on a factory reset of your Chromebook.