Welcome to fitday. What a good concrete goal you have - I like it.
For me it's all about the food. I have always been reasonably physically active and like exercise when I have time. But I only lose weight when I clean up my diet. I like "eat clean" approaches, get away from added sugar, sodium, refined grains and processed food. If I bring my lunch (don't buy it) and make my supper (no take out) I do way better and my cals are lower too! I think you need to identify where you wrong with food and then change that
All the workout time in the world (believe me I've done it) won't compensate for a junk diet.