I'm a deadly afternoon snacker. Fresh veg helps. Keep cucumber and carrot around. Salt and pepper or tajin seasoning is low in calories. Also, air popped corn with nutritional yeast or chili lime powder for flavour.
Dinners are non trivial, But veg is your friend again. A heap of steamed veggies next to a smaller portion of whatever you love. Drink lots of water, club soda, etc, anything to limit liquid calories and especially sugar obviously.