Shakeouts

In reading Bill O'Neil's, how to make money in stocks, it recommends no more than an 8% trailing stop.  At what point do you open this up when the stock increases? I identified CPE in May when it was getting ready to break out.  On 5/10/2021 it fell apart, I was shaken out of my initial purchases as in one day it rose and dropped over 10%.  By the end of the week, it crashed through the 50-day moving average.  Now as soon as my stocks clear a key moving average I set manual stops using that in case they move over 10% in one day.  MRNA is another stock I recently round-tripped, didn't lose money but missed the take some profits at 20%. On 6/8/2021 it dropped over 8%. It found support on the 21-day Exp moving Average and seems to be coming back. I got out just before it re-entered the buy zone. So I still made money, just not as much. I'd rather ride the trend and keep it simple as I'm not doing this full time so I have relied on stops and alerts.  I've been doing this for less than 1 year so I'm still feeling out the volatility.  Wanting to know more,  Thank you,  Stephen Rager