Is aftercare important after using a melasma skin booster?

I've seen a lot of talk about how important aftercare is after getting a melasma skin booster, and I'm wondering how much attention I need to pay.
I heard that melasma is particularly affected by UV rays, so I thought post-treatment care would be even more important.
I've heard that you need to moisturize well and use sunscreen for the effects to last longer, but I'd like to know if there is actually a big difference.
It is a bit daunting to hear that I need to change my lifestyle habits as well, not just use a skin booster for melasma.
For those of you who used melasma skin boosters in conjunction with your melasma management, please share any tips you have on how you managed the aftercare.