If you struggle to lose weight eating the same amount of calories that once allowed you to weigh a lot less, then it is a good indication your metabolism needs some work.
We crave quick results and quick fixes. It sells and it sells very well, in fact. But does it equip you with skills you can apply for the rest of your life?
An overly-simplistic relationship between calories in and calories out doesn't cut and the scientific realities of weight loss are not that hard to understand so, learn a better way.