Suggest Treatments To Improve Skin Tone

Hi Sir,I am an Indian and have a dark skin tone. I have applied nearly 50-70 skin lights for my skin since 7- 8 years but none proved to improve my texture. Although I am aware of some chemicals like hydroquinone, retinoic acid tretinoin mercury etc so avoid using but still I am not able to bring my tone to a lighter shade. Please suggest me the best nite cream to use.