I want to backup my phone storage
My phone is not let me download what’s app and Facebook app
iPhone 6s Plus
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You can create backups on your computer, in iCloud or on your Mac:
How to back up your iPhone, iPad, or iPod touch with iTunes on your PC - Apple Support
How to back up your iPhone or iPad with iCloud - Apple Support
How to back up your iPhone, iPad, and iPod touch with your Mac - Apple Support
After that update your iPhone to the latest iOS version, so that you can download your social media apps.
Your iPhone 6sPlus can be updated to iOS 15.6.7
Update your iPhone or iPad - Apple Support
iOS 15 and iPadOS 15 are compatible with these devices - Apple Support