Best way to grow your BTC is trading for sure.

That said, If you don't know what you are doing you will make bad trades and lose your hard earned Bitcoin..

Key to being a good trader is doing your research, I have said it over and over but it is the only way to be successfull.

I focus on reading as many crypto related articles as I can and when I have time I attend to btc meetups.

Recently I discovered some free software that predicts the future movement of several coins. www.cryptoforesight.org

Tools like this can help you making a decision but even then you will have to do your own research to be a winner.

Trading has helped me grow my BTC more than any other way, so don't give up as you will learn more every day (even from your mistakes)