You can simply grow your bitcoin by doing campaigns,trading or gambling, they are all easy to do the only thing is that some are more riskier than others.
yeah there is many way to grow up your bitcoin like as signature campaign , trading and gambling and i also think that these way minimize the risk and these are very much good than other way and you can grow up your bitcoin easily with gambling and trading.
Gambling is not the best for growing bitcoin easily because there is a high risk of getting loss on that kind of field. You don't to be full time gambler to make good profits because gambling is just for fun.
In trading, It is true that you can grow your bitcoin easily IF you have enough knowledge to understand or analyze the market so you can lower the risk of getting loss. But, If you don't have enough knowledge to start trading then you should study first and test the market with a very low capital that you can afford to lose then analyze your trading history and your past decision to be able to make better decisions. Experience is the best teacher.
In my opinion gambling is just a way to lose your hard earned money.
This is only a short time fun which can never turn into full time business unless you are extremely lucky person. Yes, I will also recommend trading, investing or other best ways to earn bitcoin/money (yes, earn money, then convert back into btc to grow it).