Well, first of all you'll need to do something about the 75 GB of photos and videos. You'll need to store them on your phone but not on iCloud. To do this, simply turn off iCloud Photos. This will keep the existing photos and videos on your device, but nothing will sync to or from iCloud. I would strongly recommend regularly backing up those photos and videos to a PC, since there will be no way for you to restore them otherwise if something bad were to happen.
Next, your screenshot shows 70.8 GB of iCloud backups. That's a lot—my iPhone backup only takes 1.6 GB. Is this only for your iPhone, or do you have other Apple devices sharing the same iCloud account?
Either way, Apple lets you backup to a PC instead of or in addition to iCloud. On Windows, you'll need iTunes from the Microsoft Store. With iTunes open, you can plug your phone into the computer and select it on the sidebar. The "General" screen will give you the option to back up to the PC. If you don't set a password to encrypt your backups, some information is not saved, like health information and passwords. Encrypted backups save as much data as an iCloud backup. More information is here: https://support.apple.com/en-us/HT205220. Note that if you DO encrypt your backups and later forget the password, there is no way to recover either the password or the backups.
On a Mac, the exact same functionality exists, except that there is no iTunes. Instead, the phone appears on the sidebar in any Finder window.
Under iCloud Storage → Backups, you can see each individual iCloud backup and how much each one takes up. You can also click on the backup and see a list of every app and how much data the app is backing up to iCloud. That may help you manage the iCloud storage if one app is backing up gigabytes of data. Again, 70.8 GB is a LOT of data.