There's always something new to try when it comes to dieting. A good strategy is making small changes and giving it enough time to see results. Only when there's no results, go make another change. Note that under 'results' in dieting we mean any beneficial effects - inches loss, fitness improvement, health and/or mood improvements, etc.
Here are a few changes that usually makes sense to consider.
1. If you tried to reduce fat in your diet without any progress, try to increase your fat intake while cutting down on refined carbohydrates (bread, pasta, potato, etc.)
2. If you tried a low carb diet and failed, try to introduce "good" complex carbohydrates like whole grains, legumes, and berries to your daily meals.
3. If you tried to exercise OR to diet separately, try to do these things together: research showed that this is a win-win combination. Not only it's much more efficient for weight loss, but the health benefits are great even if your scale didn't budge.
4. If your exercise routine included only aerobics workouts, add strength training: it'll help to build more muscles thus enhancing your metabolism.
5. If you did too much of aerobics, slow down a little bit: this type of exercise is shown to shift your metabolism into somewhat economic mode.