by you saying your metabolism is decreased i assume you are gaining weight and not able to reduce it easily. if the symptoms are less the answer is in your question.Exercise. be physically active take steps instead of elevator. wall instead of taking auto or car.
if the symptoms are worse, you need to find out what is reason behind low metabolism it can be low
thyroid function, any other metabolic disease, prediabetic condition, etc.
Next Steps
if exercise does not help i recomend visit to physician to assess the underlying cause and furthure advice
Health Tips
follow regular sleep, meal pattern. follow healthy wholesome diet.include fruits and nuts in your diet