How do I roll back iOS to version 18 from iOS 26.1?

How do I roll back iOS to version 18 from iOS 26.1? I've tried disabling most of the new animations using Accessibility Settings, but the app tiles still appear blurry for Google and Microsoft apps, the Messages app is lagging and buttons fade in slowly, swiping between apps is jittery, and the keyboard has a weird resizing glitch when it first loads. Overall, I now feel disoriented using my phone, and I just want it to go back to the way it was. Is there any way to get iOS 26 off of my iPhone 12 Mini?