I'm worried about my nasolabial folds. Is filler okay?

I am writing to inquire about fillers because I feel my face looks a bit flat overall lately. My nasolabial folds appear slightly sunken, and my front and side cheeks also lack volume. I am wondering if it would be better to focus on overall harmony rather than filling just one area. I am looking into full-face treatments covering the nasolabial folds, front and side cheeks, and forehead. What I want is a look that is naturally refined, as if it were my original face, rather than a drastically different appearance. For those who have experience with fillers, could you tell me which areas were recommended as priority during your consultation? For my forehead, I only want to slightly correct the flat look, so I want to avoid an overly convex shape. I also find it burdensome to have my front and side cheeks look too puffy, so I am curious if it is possible to achieve just the right amount of volume. I would also like to know if a full-face consultation involves treating multiple areas at once, or if I can select only the necessary parts after the consultation. Since this is my first time looking into this, I have many questions. I would love to hear real stories from those who have consulted with similar concerns.