Welcome back (though I guess you have a new account name). I wish I knew what makes the discipline turn on sometimes. I have struggled with a partial regain myself for a couple of years. I have managed to stick to my plan since January 1 but only after dozens of times saying "okay I'm going to get back on plan now" and then not doing it at all. If I could bottle up what has been different since Jan 1 and share it around to everyone on this board, I surely would.
Maybe you could start by picking one thing to change, instead of trying to do everything at once. Look at what was different in your behaviors during the time you lost 50lbs compared to now, and pick one of those behaviors to focus on for a week or two. Then you can add another, and another, and perhaps you can build up the discipline muscle over time just like you'd build up any other skill or strength.
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