If you keep falling off the wagon repeatedly it must be due to some emotional blockage. The old saying is true . . the system works if you work the system. I suggest you find a counsellor to deal with whatever is undermining your resolve. It may be hard to be honest with yourself as to what you get out of failing. A skilled person may be able to help you find that out and deal with it.
I was lucky . . it was absolutely no trouble to follow the guidelines. I lost 10kg in 6 months and, more importantly, 10cm off my waist measurement.
Another option may be to link up with a successful member . . a sort of "buddy" system. So you could monitor each other's progress. If he/she lived in the same area that would be a bonus as you could meet.