Thanks, Rob.

I am really appreciating this call from you and Cate to reassess what I'm wanting to achieve - the non-weight goals. Very much food for thought.
As to what helps me - definitely meal planning helps me - that is, to put it in the negative, it's when I don't really have any idea what to eat, and just wander into the kitchen and eat what I see (a spoonful of last night's curry, a few crackers... ) that I gain weight. And meal planning means shopping lists, for sure - especially lots of fruit and veg, the kind of things I can just pick up and eat when I feel I want to eat - like carrots.
Relatedly, starting breakfast with fruit - this morning, an orange, but it could be anything.
Another thing that has helped is not "tasting" as I'm cooking - this is tricky, because it really is easier to make something taste good if you (the cook) take a spoonful, and then think "needs more salt", and then another one, and think "maybe a squeeze or two of lemon juice" - and so on. Now, I'm more likely to call someone, and say "taste this - what do you think it needs?". That's been a great help.
Exercise - yes, it helps, though apart from some gentle stretching and tai chi, my exercise is mostly just walking. Socializing - no, that's a problem area for me! My support, apart from here, is mostly just myself; I'm helped by a (wrong) sense of pride in not wanting to "fail" and go back to my higher weights.
But those non-number goals... time to think hard!