If you're eating the right foods, but the only thing you've lost is your enthusiasm then you're probably making one of two common mistakes.
MISTAKE 1: Eating too much of it.
Brown Rice and Sweet Potatoes are great for you but not if you're 15 servings of it.
But I've heard preposterous claims by guys such as Jeff Caveliere of Athlean X saying calorie counting is useless and eating the right foods is all that matters. He's not the only one I've heard make claims like this.
Maybe with his genetics that works. But I dare you to try it and see how it works.
More important than what you eat is the amount. If you're trying to lose weight, the number one rule is to be eating at a caloric deficit.
But before you get ahead of yourself I want you to know this. You have to already be eating at an average to above average amount of calories before you cut. Which brings us to...
MISTAKE 2: Not eating enough food
If you're already at an extreme deficit and then try to cut, you'll basically be starving and throw off you metabolism. Making it work against you.
Translation: your body will cling to fat harder than ever.
So that's why I always suggest to people looking to lose weight to exercise more over eat less.
Look at it this way. The more you exercise, the higher your metabolism. The higher your metabolism, the more you can eat. The more you eat, the higher your metabolism.
So if you're having trouble getting results, look into what you're doing and see which of the two mistakes you're making.