I would suggest that you continue on trading. For me it is the most safe way to grow bitcoin rather than investing it at HYIP's because most of them are scam but not all, others will last for month but will be eventually become a scam. Or gambling it because we all know that no one gets rich from gambling.
i agree trading could be a good idea to stick with and it will be safe from other people but it appears that you are saying it can be safe from risk well that is not true because trading also has its own risk it is just like gambling in some concept . trading has many things to consider aside from that you should have a good knowledge regarding with trading but it doesn't mean you are already safe from risk you need to remember that every investments is accompanied with risk .
As for my own experience the best way is also trading but as what an old sage says that the market is like an ocean full of whales and other sorts of dangers that can drown or sunk you down if you don't know how to manage well your sails. I temporarily stopped trading when I don't have much time to study the trends and updates. Investing on reliable casinos are also a good way of earning. Another way is investing on good ICOs because you will receive bonus. Sports betting is also good when you have very good knowledge on your bets but same as trading it needs constant updates and research.