What would be best for pigmentation?

I've been stressed about hyperpigmentation lately, so I'm looking into various options. It bothers me because it feels like the spots where I used to have acne and the blemishes caused by UV rays are getting darker.

I have been consistently applying whitening ampoules and sunscreen for home care, but I definitely don't see any significant changes yet.

So I'm considering getting dermatological treatment, but there are so many types of lasers, and I'm not sure which one is right for me.