What is the filler treatment cycle and how are the effects?

I didn't used to be concerned about it, but lately the sunken areas on my face have been particularly noticeable, so I am looking into filler treatments. I was only thinking about nasolabial folds, but looking closely at my photos, my cheeks and sides also appear to lack volume, and my forehead seems a bit flat. I am wondering if it would be better to get a full-face consultation. I looked up reviews regarding filler treatments for nasolabial folds, cheeks, sides, and foreheads, and I read that the areas requiring treatment can vary depending on the face shape. I am curious to know what aspects you emphasized most during your consultations if you have experience with filler treatments. I do not want my face to become plump; I just want to moderately fill in the sunken areas to soften my impression a little. In particular, I am worried that adding too much volume to the sides might make my face look wide, and for my forehead, I want a natural curve. I am also wondering if the term "full-face" implies that I must have treatments on multiple areas. I would also like to know if it is possible to select and proceed only with the areas that are necessary for my face after the consultation. If anyone has had a consultation for the first time, I would appreciate it if you could let me know what questions I should prepare.