That strategy requires you to have good timing on the market. But the problem is, by doing so, it will make you emotional and you will be prone to make mistakes making you lose some of your money.
If you want the best strategy for ordinary investors like us, "buy the dips". If you have a job you should save 20% of your monthly salary and make that available to buy when Bitcoin's price is falling.
Plus a lot of patience, whenever you want to buy or sell your coins you should always consider your resolve because impatience clouds our decisions and it might make your investments in a bad position. Watch the market, take advantage on the different changes in the charts , buy coins then sell whenever it reach your profitable goal.
It is necessary to determine what profit you are willing to receive from each coin. You do not need to be greedy. set a small profit of 7-15 percent and sell.