If you're really interested in investing and have a decent money to invest, Why not just invest in bitcoin? Buying your bitcoins to keep for the price to increase is not really late cause its price will go higher as the time pass by . I think that's the best way to earn bitcoin if you have the money but if you don't, You might want to increase your rank here and your post quality to join into some signature campaign?
Because price may not grow any more
Well, at least not in the nearest future. In fact, it can actually even drop. Since we don't know for certain whether it will grow or fall, the best strategy would be investing and trading, not investing alone. Buying, holding and hoping may feel comfortable, of course, but it is far from being an excellent investment strategy. And yet more so in respect to such a volatile asset as Bitcoin
Try Forex with Bitcoins. Some people in Forex make a lot, some loose too. Bitcoin price is going up, if you buy now, after some weeks you can sale your Bitcoins, and make good profit. Or you can invest in gold, silver, fuel too through Forex.
And stay away from Forex