Can fillers naturally add volume?

Perhaps because I tend to have thin skin, my facial features seem a bit flat lately. In particular, my cheeks look sunken, so I often hear that I look tired. Would getting fillers help improve this? I don't want a face that looks too puffy or artificial; I want a natural change that looks like my natural face. I am curious about the effectiveness of fillers and whether the recommended treatment areas vary depending on face shape. People around me say that the amount of filler injected is important; what is the typical starting amount for first-timers? I am looking into dermatology clinics in Gangnam, and I am wondering what I should focus on checking during a consultation. Rather than just adding a lot of volume, I want to get an amount that suits my face, so I would like to hear the experiences of those who have received natural-looking filler treatments.