If you fall off the wagon, as you say, the only thing you can do is to climb back on and try again. It’s that simple. As you stay on the diet, your body will slowly adapt to lesser carbs and sugar than it’s used to, and the diet will slowly become easier. But you need to stay on it long enough for this change to take place.
It sounds like you need a protocol to follow. Read the forum’s protocol linked below, maybe it’ll give you some ideas, or you may decide to follow it. If you do decide to use this as your protocol and want a copy of the forum diet, just let me know by private message. It’s free.