korean skincare help plz

I want to have brighter skin - i feel like my skin looks so dull, i look more masculine.
I have acne and acne scarring so it takes away some brightness but idk how to add brightening into my routine. I'm scared of adding new products in bc i break out so easily and my skin is sensitive.
I've been using tret for 9 months and I've been wearing sun cream nearly everyday for 2 years.
I was thinking i might get the skin1004 centella ampuole and the brightening ampole. but idk

Hi- some of the skin care ingredients purposely causes breakout, eventually after using the product several times and being more consistent with it, the breakout will calm down. I’ve been using CeraVe hydrating cleaner for normal and dry skin + CeraVe facial moisturising lotion SPD 50 and additional Nivea sun cream. My skin as felt more smoother and glassy, sun cream should be applied serval times a day. Personally I don’t think you should buy skin care products that are labelled as “Korean”, as they charge premium price for products that don’t work.

Yeah i haven't had much luck with cerave - it was the first skincare brand i ever tried and it sort of ruined my skin and burnt it. The onlt western brands i use is the Cetaphil gentle foaming cleaner, salicylic acid by the inkey list. Also i found with korean products, they are the same price was western products (i buy it on yestsyle and thats pretty cheap) so i'm not that worried when it comes to money.
When it comes to applying suncream, what do u use to apply it? If you're in public, how do you ensure your hands are clean before putting it on and what do you do with makeup on?