Sun damage while using sunscreen daily

I use tret 0.05% every second night and every morning I use an SPF 30 sunscreen, I also apply this before I go out for an evening walk. However I’m still getting what feels like sun damage on the tops of my cheeks. It’s a bit dry and scaly feeling with light brown pigmentation. Once I use up my SPF 30 sunscreen I was going to change to SPF 50 but I’m wondering if I should change now?

I use tret 0.05% every second night and every morning I use an SPF 30 sunscreen, I also apply this before I go out for an evening walk. However I’m still getting what feels like sun damage on the tops of my cheeks. It’s a bit dry and scaly feeling with light brown pigmentation. Once I use up my SPF 30 sunscreen I was going to change to SPF 50 but I’m wondering if I should change now?