How do I free up space on iCloud when I have already deleted many photos and turned off iCloud photos but not "my photo stream"? How do I free up space on iCloud when I have already deleted many photos and turned off iCloud photos but not "my photo stream"?

I want to be able to back up my iPhone with the iCloud but there are so many pictures taking up space in iCloud it won't back up now.

I have already downloaded all my cell phone pics to my computer; So I don't need the iCloud to back up pictures. 

Please help.
To remove Photos (Photo Library) from iCloud backup:


Please open Settings/ your name iCloud
Open Storage/Manage Storage
Open Backups (iOS12) / select the backup for your iPhone
Switch off the Photo Library - this will exclude the Photo Library from the backup (you can do it while backup in progress)
Tap Turn Off &amp; Delete (if already exists)