Hello and welcome.
You can't erase the drive that you are currently booted from. Before you go that route, maybe we can help you recover the "Other" space that is being taken up.
-Are there items in the Trash that haven't been emptied/deleted?
-Do you have a Gmail account setup in Apple Mail?
-Have you looked at the folders in your Home folder to calculate their sizes?
-Do you have a lot of iOS device backups?
You could also try an app like
OmniDiskSweeper to see what is taking all of your hard drive space.
C