I just came through a similar situation in that I lost >85lbs (between 2004-2009) and maintained that lost until 2014 when menopause really kicked in and I started dropping stitches in my own life knitting. Regains 30 lbs quite quickly. I decided to go back to WW since that was a big part of how I'd lost the weight originally. I started and restarted that program 6 times before finally trying hard enough by starving myself to lose dribs and drabs of poundage (avg loss of 1.5 lbs a month on approx 900kca/day). I quit that, of course, 900kcals/day is unsustainable.
The W30 came along quite unexpectedly for me as I hadn't heard of it before. I had, by this time, quickly regained the losses from my futile WW project (ugh) and was feeling so miserable. I was standing at a table popping homemade chocolate covered peanut butter balls into my mouth like they were breath mints. I was feeling so physically ill (it was Christmas time and there'd been the customary onslaught of super rich, calorie laden food) and so guilty when the W30 logo on a bottle of sugar free ketchup caught my eye.
It struck me that the absolute and strict rules would appeal to me - a right and proper challenge. I took that as a sign. Then, I did what I encourage all of my life coaching clients to do - I started with my commitment. I know that if I am going to make a change, I need to be committed to it. I need, as Shani said, to start with my why. My WHY was to feel physically less awful - I'm 59, I'm tired of feeling so terrible with out of control IBS, asthma, joint pain... So, my WHY was rock solid. I wrote it on a card and stuck it on my fridge - that was the first step.
After that, I had to commit to this W30 thing - so, in order to do that, I had to look at all of the other things I might be committed to and decide how to manage those things that were in conflict. One thing I'm very committed to is having an easy life - little or no stress. My work is hard enough, I don't want to have a hard life too. So, this shows up in lots of little ways like not wanting to make dinner as I am too tired and just want to sit on the couch and watch TV. I prefer to sit and chat with Hubs over a glass of wine and a plate of cheese and crackers. Right off the bat, I know I can't be committed to that easy life and doing a W30 at the same time. Another commitment I have was to my social group and our ways of having fun - involves fancy restaurants and definitely non-W30 foods! Once again, I had to think about that commitment vs the one I wanted to make to W30. I did all this work in my head before I ever embarked on my first W30 on January 3. It takes some effort and thought to decide which committment is going to win out. We are always committed to something - as my coaching clients figure out, sometimes our commitments are hard to see because they are buried (it took me a long time to realize I am truly committed to just sitting and watching TV every evening!)
So, long story but maybe you're taking something away from it. I know that once I truly committed to the W30, it was easy to stay on program. I lost 10.7lbs on it and am still losing weight as I manage my postW30 experience. I don't want to go back to feeling terrible because of my diet.