What should someone who has only been using all-in-one products change first?

To be honest, I haven't paid much attention to my skin until now, so I just washed my face and applied an all-in-one product.

However, as I gradually got older, my skin started looking rough and the pores around my nose began to become noticeable, so I wondered what I should do now.

There are so many types of cosmetics that it is actually difficult to get started. I am wondering whether a skincare beginner should change their cleanser or their moisturizer first.