Wow. I cannot tell the exact screen-on time from that screenshot, but you unplugged it on Sunday at 23:18. Monday’s screen-on time is a little under 3 hours, what, 2h 45 min? I don’t know whether you used it on Sunday between 23:18 and 00:00, but even if you did… that’s about 3 hours 27 minutes of screen-on time, at best, from 100% to 8%. I don’t know exactly how you used it, I don’t know what the deleted app was, and I don’t know settings and brightness, but that is very poor almost regardless of that.
The fact that throughout the entire screenshot you used more than 100% and screen-on time isn’t even that high only reinforces my point further.
The Xs’ battery life was never astonishing, but according to screenshots back on iOS 12 it could quite comfortably reach at least 7 to 8 hours of moderate use. The X and the Xs were between 4.7-inch iPhones and Plus models, so more than 6-7 and less than 10-12. Between 7 to 10 hours depending on use. That screenshot shows… 3 to 4 hours. Or half that of iOS 12.