This is me! And this is what has worked for me:
30 minute walk at lunchtime (non-negotiable, regardless of weather). Pop an audiobook or podcast on, or call a friend and get outdoors. I have a dog, so this is an easy way to "have" to get out of the house.
Plan lunches - I make a huge Instant Pot full of lentil and tomato soup (happy to share the recipe if you want it) at the start of the week, and freeze it in portions. It costs about £2 for five portions and is filling and has barely any calories.
Mid-afternoon snack (important for me) - an apple with some peanut butter to keep protein up. Don't keep snacky crisps / chocolate etc. in easy reach, but if you are really craving some, have a small portion and then move on.
Normal family dinner (not huge portions).
If you're a gym member and your work is flexible, try to attend a couple of gym classes a week too - I always get more done in a class as I don't quit halfway through in the same way I would do if I was using a machine by myself.