Mom of 3 looking to lose 100 pounds!

So my story is long I will keep it short or at least try to. Well I have always had an issue with my weight. I am 35 years old. In 2014 I started my weight loss journey and lost 30 ponds in 3 months then I became pregnant, I unfortunately had a miscarriage at 12’weeks and fell into depression gained all the 30 and then some. Then in 2015 I became pregnant with my daughter I have 2 boys already. I gained like 40 pounds and since I had my daughter I wasn’t motivated. Finally this year I have decided to make a change in my health. I’m looking to lose 100 pounds. I know it won’t be easy but it will be worth it. So any all motivation will be wonderful!