If you move your iPhone 7 or iPhone 7 Plus to iOS 13.2.3, and you can't stand its performance, note that you can no longer downgrade to the previous version of iOS 13.
Apple has stopped signing on iOS 13.2.2 which means you can no longer use a loophole to drop back in an effort to improve performance.
If you really want to get off iOS 13.2.3 you can try moving your device to the iOS 13.3 beta. The beta isn't an ideal daily driver, but it's certainly worth investigating if your phone is really struggling.
If you're unfamiliar with the iOS 13 downgrade process, take a look at our guide.