How should I manage acne pigmentation, which is more concerning than acne that has disappeared?

Even after acne has subsided to some extent, acne pigmentation often persists, causing stress. Especially in the winter, skin regeneration seems to slow down, making acne pigmentation seem even more persistent. I'm curious whether acne pigmentation naturally fades over time, or if it persists if not treated early. I'd also like to know if home whitening treatments or regenerative creams can improve acne pigmentation, or if laser treatments are necessary for effective results. I'd also like to know more about daily habits I should be mindful of or methods I should avoid to avoid worsening acne pigmentation.