I'm curious about how to make your face whiter.

Hello!!! I'm curious about how to make my face whiter...

These days, my skin seems to be getting dull and my complexion is getting darker, so I'm really worried ㅠㅠㅠ I want to know how to whiten my face, how to reduce pores, and how to manage pores..!!! I'm also curious about how I can see whitening effects if I use it consistently, and what ampoules are good for pore management! I'm also curious if glutathione injections would be effective for whitening my face!!!

Thank you!!