Yes, your strategy is simple trading. Sell high buy low. But this needs more attention in the price when will it fall and when it will go up again. Also, this requers research, strategic planning and statistics for you to determine or forecast the price.
It seems to me a very simple strategy. I am sure everything is not so easy. Sometimes it is better to exchange Bitcoins to other cryptocurrencies that are promising even when BTC price is pretty high.