Log out of these sites if you are logged into.
Note: Shopping and notification sites
Empty the shopping cart/ bag.
Log out of the account.
Delete Databases and Local Storage items
Backup your Mac.
Quit Safari.
Hold the Option key on the keyboard down and click the “Go”menu in the Finder menu bar.
Choose “Library” from the dropdown.
Scroll down the list.
Click open the Safari folder.
Scroll down the list and click open the “Databases” folder.
Click open the “IndexedDB folder”.
If you find the items there, right click and choose “Move to Trash”
or select all and move to Trash.
Scroll down the list and click open the “Local Storage” folder
Right click the items you want to remove and choose “Move to Trash”.
Restart your Mac, launch Safari holding the shift key on the keyboard down and test.