First, i would recommend TRADING to earn Bitcoin as it is easy to deals with as long as you are well educated in TA's, FA's and reading charts and dealing with Fud news. This has been one i does to earn more profit and bitcoins. Secondly, you may opt to join signature campaigns as you just need to put effort and time to promote ICO'S in the market and instant money.No money invested just pure time and dedication. Third is gambling, as what goes around, the higher the risk, the higher the return  .play accordingly on what you afford to lose.