NAS100 - Do you trade before it drops or ride the trend until it

NAS100 - Do you trade before it drops or ride the trend until it drops? NAS100 showing signs of dropping from 10,000. Should you get in anD take on the risk of more upside before the drop? Or, do you ride the trend up with tight stops until the trend breaks, then go short? Developing a trading plan is a sport. What's your game plan?