Set a stop loss for one week at a time. Make it the standard deviation of weekly maximal movement in a years history. This means that 62% of the time, a stock’s price should not move more than a specific amount either up or down from the last Friday close. After each week stop prices will get calculated newly and adjusted but only in the trading direction. This way you get something like a weekly trailing stop. It is sort of a volatility based stop loss, which should shrug of small random price fluctuations and is expected to be triggered on significant adverse movements only.