The main idea of the strategy is that in the event of a sharp unexpected drop, coins usually grow back quite quickly. We simply draw a short SMA, and when the price deviates significantly from it, we buy, and when it returns, we sell.
We cannot buy every drop; it must be quite strong and sharp. If you buy early, you can buy at the beginning of a downtrend and sit in the position for a long time. Trying to buy very low will result in few trades.
However, you can trade several coins at the same time, and if you choose the parameters, you can get a stable profit.