It's likely a change in your hormone levels. My daughter uses sulfur. It got her clear for some time and then it stopped working. So our esthetician ramped up her sulfur medication and she got clear again and has stayed clear.
You likely need a ramp up. We've had great results with Lumiplexion. Dan's products do not offer customization, which many people need. If you want to go the website www lumiplexion .com and send her a text or email. Tell her what your skin is like (a picture is better) and what products you're currently using. She will design a plan for you. Her products last a long time. We've gone to her for over 25 years.