It might not seem like a big deal, but what I put the most effort into is drinking water.
I used to live on nothing but coffee, but now that I am consciously drinking a lot of water, I can definitely see my complexion becoming clearer.
As my skin has become clearer, my blemishes look less noticeable. At first, going to the restroom frequently was a hassle, but now it has become a habit, to the point where I feel anxious without a tumbler.
I think basic habits are really more important than expensive cosmetics.