I too have yoyo-ed for years trying various "diets". I have been back on my plan for a month now and going stronger than ever. My suggestion to you would be watching a paying attention to what you eat and making healthy choice, not a soup diet. For example eating all fruits and veggies,whole grains,and nuts for a week will give you much more variety but still be healthy for you. You will not be satisfied with your meals and look forward to the end of your "diet" if you just eat soup for a week. I have found my sweet spot in eating a variety of fruits, veggies, lean protein, and nuts each day and making healthy snack decisions. I know it sounds like a cliche, but it is true. I started using the food tracker to get my correct portion of carbs, fat, and protein PER MEAL and it REALLY REALLY does make a difference. I am not hungry throughout the day and I often find myself eating my snacks only to make sure I get in my proper calories for the day (not because I'm hungry). Also staying hydrated by getting my proper water intake also has cut down on my feelings of hunger. They say if you are thirsty, your body sometimes shoes signs of hunger which makes you think you need to eat. That was really the case for me. Once I started eating properly I can honestly say my cholesterol and sugar levels have drastically changed for the better and I feel much more energized.
Good luck on your weight loss journey, it may not be easy but it will be well worth it!