I am not able to back up my iPhone ? Even after enough storage

There are two places you can keep backup (iTunes or iCloud)

Here is the process for iCloud Backup and Restore...

Use iCloud Backup and Restore.

How to back up with iCloud

1. Connect your device to a Wi-Fi network.
2. Go to Settings > [your name], and tap iCloud.
3. Tap iCloud Backup.
4. Tap Back Up Now. Stay connected to your Wi-Fi network until the process completes.

How to back up your iPhone, iPad, and iPod touch - Apple ...

Restore your device from an iCloud backup

1. Turn on your device. ... 
2. Follow the onscreen setup steps until you reach the Apps & Data screen, then tap Restore from iCloud Backup.
3. Sign in to iCloud with your Apple ID.
4. Choose a backup.

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Restore your iPhone, iPad, or iPod touch from a backup ...

Back up to Computer...

How to backup with your computer

1. Connect your device to your computer. On a Mac with macOS Catalina 10.15, open Finder. On a Mac with macOS Mojave 10.14 or earlier, or on a PC, open iTunes.
2. If a message asks for your device passcode or to Trust This Computer, follow the onscreen steps. If you forgot your passcode, get help.
3. Locate your device on your computer. If your device doesn't appear on your computer, learn what to do.
4. If you want to save Health and Activity data from your device or Apple Watch, you need to encrypt your backup: Select the box called Encrypt [device] backup and create a memorable password. If you don't need to save your Health and Activity data, you can make a backup that isn't encrypted. Just click Back Up Now.
5. Write down your password and store it somewhere safe, because there's no way to recover your iTunes backups without this password.
6. 
7. When the process ends, you can see if the backup finished successfully.
8. 

Restore your device from a backup on your computer

1. On a Mac with macOS Catalina 10.15 or later, open Finder. On a Mac with macOS Mojave 10.14 or earlier, or on a PC, open iTunes.
2. Connect your device to your computer with a USB cable.* If a message asks for your device passcode or to Trust This Computer, follow the onscreen steps. If you forgot your passcode, get help.
3. Select your iPhone, iPad, or iPod touch when it appears in the Finder window or iTunes. If your device doesn't appear, learn what to do.
4. 
5. Select Restore Backup. If a message says that your device's software is too old, learn what to do. 
6. Look at the date of each backup and pick the most relevant.
7. Click Restore and wait for the restore time to finish. If asked, enter the password for your encrypted backup.
8. 
9. Keep your device connected after it restarts and wait for it to sync with your computer. You can disconnect after the sync finishes.
10. Get help restoring from a backup.