No, we are not going to get a major revamp of UI in iOS 12, 13, 14, or anywhere in sight. Go to Android if you want big change.
Probably not until we're doing some AR/VR stuff, where you are virtually grabbing icons/files and grouping them or stuff like that.
If you are "bored" with the OS, then you need more to do in life.
The majority of your smartphone time should be spent in-apps doing your business (tasks, social, media, games, etc.), not worrying about the OS design or spending most of your time worrying about its looks. A proper OS is designed to have minimal visual impact and primarily facilitate easy operations into your apps/business.