Back at it after pregnancy

My name is Anna, after my first I gained a lot of weight. So, I got this app and lost 35lbs in like 9 months. Then I went through some hard times, had another child and gained back 20lbs of what I had lost. So I'm back at it after baby #2. I'm 5'8 255lbs 26 years old and breastfeeding. Any tips for sustainable meals to meet high protein goals and lower calorie intake would be appreciated :)