What skincare product should i buy?

Hi! I have hyperpigmentation sa face ko because ang dami ko acne before. Ngayon, konti nalang acne ko but andami parin marks or hyperpigmentation ba? I've tried luxe organix na serum but nagkakabreakout ako pag gamit ko yun. I only use soap and moisturizer. Please note din na I have an oily skintype and very sensitive. Do you think sunscreens would help? And if so, anong magandang sunscreen to use?