Investing requires more discipline than a strategy. Since its timeframe is longer than the usual short trade, you need to stick with your planned time-frame no matter how high price has gotten or how low, as long as it doesn't cross your buy level.
Yes it was a good strategy since you are fixed on your plan but it still better if you see that you already get high profit then sell it so that you wont lose it if the price get down again. But the best strategy in investing was read and understand first everything about it so that you will not get scam in the end