2. If you're not complaining about your iPhone X's speed while running iOS and apps, then it's hard to make the case to upgrade to an iPhone 11 Pro.
The iPhone 11 Pro's new chips might offer better performance, but unless you're actively unhappy with the iPhone X's performance, the iPhone 11 Pro's performance boost won't make a huge impact.
3. The iPhone X still has a great camera.
You don't get the iPhone 11 Pro's Night Mode or the ultra-wide camera, but those are just perks, not must-haves.
4. The iPhone 11 Pro has a fancy new "Super Retina XDR" screen, but the iPhone X's "Super Retina HD" screen still looks great.
The iPhone X's screen still has all the important stuff to make iOS, apps, and content look great, like HDR, TrueTone, and a wide color gamut. Both the iPhone X and iPhone 11 Pro even have the same sharpness at 458 pixels-per-inch.
The iPhone 11 Pro's screen has better contrast ratio and brightness. If you ever complained about your iPhone X's contrast ratio or brightness, then you could add it to your list of "pros" to upgrade, but it shouldn't be the only reason why.
5. The iPhone 11 Pro has a technically better selfie camera, but not by much.
If you're happy with the iPhone X's selfies, then why upgrade?
6. Your iPhone X is lighter than the iPhone 11 Pro.
It's even slightly thinner and smaller overall.
7. If your iPhone X's battery life is starting to dwindle but everything else about it is fine, maybe try replacing the battery for $70 at an Apple Store instead of buying a whole new iPhone.
Long story short: save your money and keep the iPhone X.