Without meaning to sound rude, is that idea not simply running away from whatever the real issue here is?
You need to find out why you are lapsing (stress, boredom, anxiety, do you feel you are 'done' with losing weight....) - leaving your group and joining a new one isn't going to make that happen, and it won't leave behind whatever the real problem is either.
If you want a fresh start, give yourself one; you don't need to change groups / LLC to do that!