Vitamin C serum + Makeup Application

I’m in desperate need of advice and asking for your help! I’ve been using vitamin c serum for years and have noticed that using any type of liquid/cream makeup after applying the serum causes it to pill. It PMO so bad! I follow the serum with a moisturizer and have let it absorb for over an hour before applying makeup and it I still see the same results. I end up omitting the serum and just sticking to a moisturizer which leaves my makeup flawless. I really want to be incorporating a vitamin c serum consistently though…

Should I apply just a few times a week when I’m not wearing makeup? Does it not need to be a daily routine?

Can I apply it at night? I am already using a retinol at night with moisturizer.

Thank you in advance for any guidance! 💖💋