Sounds like my story too (lost 25kg about 7yrs ago and kept it off). I generally rotate on a 1-week cycle. The only daily rules I follow are (1) never eat noodles more than once a day, and (2) eat some green vegetable/s once a day. I also never keep food in my apartment to easily avoid snacking, so some days when the weather's bad I'll only eat twice. When I go to an eatery (restaurant or canteen stall), I usually have the same meal every time, but there's about 10 different places I eat at, so I'm making the choice of what to eat when I choose which eatery to go to.

Yeah I developed a stable of foods that I knew the calories of and rotated through those, made my calorie tracking easy.