Noticebly larger amount of free space reported compared to the graph in Storage view
Sometimes spotlight can mess up that graph.

I would open Finder and use the preferences to change the setting on calculate all folder sizes or use a tool like Daisy Disk to double check the sizes.

If you have that much space used but things are mis-classified, you can reset spotlight and leave the machine running for a few hours as it re-reads the storage contents.

If you don't have that much space used, boot to Recovery HD and run Disk Utility to repair the volume and drive.