I am growing my bitcoins with the help of signature campaign and trading as I don't have an habit of spending them so whatever I get from signature campaign I try to save them and once I reach to a satisfactory capital I start investing that in different altcoins which helps me in growing my bitcoins faster.
This is a good strategy that you make your money doubled using your earning not buying coins and invest.
Signature Campaign really helps on earning money or coins, especially when you are in high rank no wonder you can earn big amount per post and so per week. Also the trading, if you really know how trading works and you know when is the good timing to trade on for sure you will be rich on that.
Altcoin is not that much advisable since there were coins that really good at first but really scammed after your money taken.