I think this 4 idea is good :
1. Cloud mining
2. Gambling / become the bankroll (choose a great gambling site)
3. Loan your BTC (be careful)
4. Sell your BTC when price is high
I think we all want to grow our bitcoins. You just have to find your tolerance for risk since there's no profit without taking risks. Question is how much risk for how much profit?
Bigger Risk, Bigger Proft
Small Risk, Small Profit
I'm only take small risk (cloud mining)