Black female with dark skin, is there any other ways to even out your skintone besides skin lightening? (photo)

Hi i am a 18 year old black female with dark skin and i have a very uneven skin tone. My face,neck,outer arms, stomach and butt are 2-3 shades darker than the other areas of my body. I guessing the reason why my skin is like this is because the lighter areas of my body is always covered. I rarely ever wear shorts and tank tops even in the summer. I wanted to know what would be the best way to even out my skin tone, (could it be just sunbathing?). I still want to keep my skin dark. Thank you

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