I somehow agree on this. I have never been a fan of these "quick" profit kind of ventures like gambling. I like day trading, but it certainly needs a lot more knowledge, and you also need an expanded portfolio to be able to trade aggressively and with diversity. The success rates of your trades would be higher if you trade for more coins than a few. However, to answer you question on how to grow your Bitcoin, the best way is to either buy an increment amount every now and then or join projects that reward its joiners in Bitcoin, although those projects are rare to find.