Brown girl tan/how to get darker?

Hi! Sorry if this is a weird ask, hope it doesn't come off unusual, but as a brown Desi girl with medium/light skin, whenever winter comes around, my face gets pale brown, and immediately in spring, my skin tone revives. Still, my skin looks weird, like my neck and face will be whole different colors. On top of that, I have slight hyperpigmentation around my mouth & dark circles. I was wondering if anyone has beauty tips on how to maintain a balanced brown skin tone/glow? Also idk how to word this, but even tho my skin gets more lively in the summer, there's always a grey undertone - so lowkey if anyone knows how to reverse that or how to get more tan/darker to hide that, I'd appreciate it?