A synonym for “improve” is “enhance.” To improve means to make something better, while to enhance means to make something more valuable. For example, you might improve your grades by studying harder, or you might enhance your appearance by getting a haircut.
Improving something can be important for a variety of reasons. For example, improving your health can help you live a longer, happier life. Improving your relationships can make you feel more connected to others. And improving your financial situation can give you peace of mind.