cannot update ios13 to ios14
cannot update ios from ios 13 to ios14
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You likely own an iPhone 6s or older, if you are on iOS 13. iOS 14 hasn't been signed in at least 2 years now, so the maximum iOS version your iPhone can be updated to is iOS 15.7.1. Since you haven't updated your iPhone in at least two years, you will need to use your computer to update your iPhone.
This will help you. Choose whichever you use (Mac or Windows):
If the update hasn't appeared on your device, use your computer to update your device manually. Find out how to update your device manually if you're using a Mac with macOS Catalina or later, or if you're using a Mac with macOS Mojave or earlier, or a Windows PC.