If you're looking to significantly increase your metabolic rate, there are a few expert-approved things that work. First, begin strength training and building muscle. Muscle is more metabolically active than fat, which means the more muscle you have, the more calories you'll burn in a day. Here's a metabolism-boosting workout and a four-week strength-training workout plan to get you started. Dr. Arad also recommends doing cardio to help boost your metabolism since you will be expending more energy and burning more calories per workout.
When it comes to your nutrition, there are a few key things you can do. Eating more protein and foods with healthy fat will make it harder for your body to process, digest, and store them, which means your body will be expending more energy to do so. You should also minimize the amount of processed sugar you're eating. This is because sugar has a relatively low thermic effect (it's super easy for your body to break down) compared to fat and protein.