I don't really have a strategy that I use. I just buy some Bitcoins every now and then when the price has gone down to hold for the long term. That's all I do at the moment. I am not even trading. It's purely holding what I do. I am so happy with my Bitcoin investment that I never look into any other investment. Bitcoin is more than enough for me as I believe in its full future potential.
This is also my strategy which is to buy Bitcoin during the dumps or when the price is low, and will hold it for a long period of time until its price become high. Given the fact that Bitcoin's price increases from time to time, it means that as its value increases, the profit that its user will earn will also increase. Investing into Bitcoin will surely give you big profit now that its price is continuously increasing which means it is worth investing.
I dont even see any strategy involved in making investments, you just need to watch out for fake sites, scammers, thieves, ponzi schemes etc. Just dont end up handing your money over to them, or they will make away with it. But there seems to be strategy though, you just have to invest when price is low and make profits as it starts going up.