I'm worried about pigmentation

These days, washing my face and looking in the mirror every morning has become a real chore. Before, even if I had breakouts, they would quickly subside and my skin tone would return to its normal state, but that's not the case anymore. I have dark, stubborn acne pigmentation here and there on my face. Because of these marks, I find myself spending more and more time in front of my vanity before going out. No matter how meticulously I apply concealer, the darkening returns in the afternoon. Seeing myself in the mirror makes me feel dull, sapping my confidence and making me look down. I consistently apply vitamin ampoules and whitening creams, and even try to eat healthy, but the acne pigmentation just won't go away. I know I need to be persistent and not rush things, but I can't help but feel frustrated. How do you all deal with these concerns? Do you have any effective skincare methods or routines you'd like to recommend?