What should I do to protect both the skin from blemishes and dark spots while maintaining the skin barrier?

Hello. As summer approaches, I feel like my melasma and blemishes are getting darker, and it doesn't seem like it's just my imagination. I previously received a Ruby Laser treatment hoping to get rid of them completely, but the redness that developed afterward hasn't gone away. Since my skin is quite thin and sensitive, I realize I need to be very careful when it comes to removing melasma and blemishes.

Since then, I've tried laser toning and pico toning a few times, but I was disappointed because I didn't really feel any effect. That said, it didn't feel like there was absolutely no stimulation either...

For those of you with sensitive skin like me, what methods do you use to effectively get rid of freckles and blemishes while protecting your skin barrier? I want to have clear and strong skin!