I have a question about how to whiten skin and restore skin tone.

Recently, I have been worried because my skin tone has become noticeably darker and my overall skin texture feels dull and dirty.
I'm looking for a solution because it seems to be darkening my impressions.

I have a specific question about practical skin whitening methods that can improve skin changes and make skin clear again.

Home Care Routine: What whitening functional products contain ingredients to improve my current dark, dull skin condition, and does regular exfoliation help whiten my skin?

Lifestyle: Besides drinking enough water and getting enough sleep to improve skin tone, what specific nutrients (like vitamin C) can you consume or what diet can you follow to help suppress melanin production and brighten skin, and do these actually help whiten skin?

Professional Care: If home care alone is not enough, what are some effective skin whitening treatments you are using?

I would appreciate it if you could tell me how to whiten my skin to turn my dark and dirty face into clean and white skin.