1. Serums first. These are the lightest and sink into the skin the deepest. Hylauronic acid and Retinol's would also be the first step.
2. Seal in that serum with a moisturizer.
3. If you are using a face oil it can go after a moisturizer, or in place of.
4. Eye cream next.
5. If it's day time, SPF is last.
Have you been applying your skincare products properly?