A tool does not replace your skincare. It changes how your skincare lands, and it changes the five minutes you spend putting it on.
Face cupping works by lifting rather than pressing. The suction draws circulation to the surface, encourages lymphatic drainage around the jaw and under the eyes, and leaves the face looking less held and less tired. Gua sha does something adjacent, with pressure and edge rather than vacuum. Most people get on better with one than the other, and the only way to find out is to try.
Both need slip. Use a facial oil underneath or the tool will drag, which is uncomfortable and does nothing useful.
The Madam S cupping and cleansing set includes two facial cups for cheeks, jawline and neck, two smaller cups for the delicate area under the eye, and a silicone cleansing pad.
Start with two minutes a side, two or three evenings a week. It is a practice, not a procedure.