Can I make my facial bone structure less prominent/flatter?

Without pictures to go on, it is hard to say. For the nose it sounds like a rhinoplasty to make your nose smaller is what you are looking for. Depending on what other prominences bother you, can can contour down bone to create a softer, flatter appearance. Fat grafting/transfers may be an option depending on the location, but refining bone is a little more predictable. I would advise setting up a consultation to discuss your options in a setting where we can see you in person or virtually and have a better idea of what you are looking for.