I’m so glad to hear that your skin is doing so incredibly well. You have quite a few options available to you in terms of serums. I realise there is a sense of convenience in simply choosing one serum that can do everything, and if that is really what you want, I can very highly recommend Skin Medica’s Essential Serum. In my mind, that is the closest thing to an “all in one” product. If however, you would like a good serum that does everything you need to protect you during the day (and will boost everything you have already achieved), I would highly recommend Skin Ceuticals’ Phloretin CF Serum, which you would only need to apply in the morning. These are just two options that I believe to be incredibly effective, but there are other really amazing options available to you as well and you are very welcome to let me know if I can assist you further.