What diet plans have you followed in the past? I would suggest making a list of the various diets you have followed, and write down what it was about them that failed or succeeded for you. Then go from there.
Find out if you need specific structure or if you are successful when making your own choices. Determine if you need more or less in food quantity. For example, if you are used to larger meals, and crave something to chew, then a liquid diet would likely be too difficult for you to stick to.
Some people may hate me for saying this, but I believe there is no magic formula, and no miracle diet. Weight Watchers, Low Carb, Sugar Busters, etc.... Unless you have a specific health problem (such as diabetes), then there is nothing unique about any of these diets that makes them any better for you than the other. They all include nutritious meal plans which restrict your overall food consumption levels, and they encourage exercise. In the end, it's all about fat and calorie intake, and increasing physical activity. The trick is finding something that is compatible with your personal tastes and habits, so that you CAN stick to it.
Please let us know what you decide to do

And if it doesn't work, and you decide to follow something else, keep us updated? We all try many different methods before finding something that is just right for our own selves.