Begin each meal with a glass of cold water. Another idea is to have lots of salad on hand so when you need to munch on something, you have a healthy option
make yourself a goal in term of what you want to weigh after pesach and set aside a reward if you manage to keep to your goal. or punishment if you don’t make the goal. make sure the goal is realistic. like I will not gain more then 2 lbs. it can even be I wont eat any desserts, or I can have one dessert but then I need to go jogging for an hour.