Anyone please tell me some way or site to Earn bitcoin.

I have some bitcoin (0.5 btc) and i want to earn more.
 I search many site but i can't find genuine site that really work.
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I will invest if anyone tell me the right way to earn btc.
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I found that there are many types of earn btc. That are,

Tradeing
Mining
Cloud mining
Freelancing
And many more.

Please make a comment if you have better way to earn btc.
Thanks.