Well if u ever decide to lighten your skin again, I'd advise against using commercial products because they tend to have scarey chemicals in them that are very bad for you skin. So stick to gentle stuff like lemon juice, lactic acid and creams that AHAs in them -it will take longer but u won't end up with pitted and scarred skin when you older.
Other wise just be happy with the way you are, bleaching skin to get lighter and tanning skin to dark is a bit silly in my opinion, not to mention how dangerous it can be.