Incorporate new products into your routine one at a time, and give them *at least* a good two or three weeks to see how they work and how your skin reacts.
All you really need is a cleanser, some sort of treatment targeted to your skin’s main concern, moisturizer, and SPF. We’re here for minimalism in the new year.
To really maximize sun protection (yes, even in the winter or on cloudy days), use a dedicated face sunscreen — mixing SPF with other ingredients makes it less concentrated, so if you’re relying on a moisturizer with SPF, chances are, you’re not applying enough to really protect your whole face.