A better life is not achieved just by thinking, it gradually becomes better with better choices and habits in your routine, which may seem very small now but will add great quality to your mental and physical health. You can add these habits each at a time, that way it would be easier for you to adopt them in your life.
Switching to good habits can bring you healthy and happier life as achieving either happiness or good health both are an inside job, thus it needs a healthy body and mind, which can only happen with your small efforts towards your own well-being. I am sharing few ways to do it.