My charting software from Market Traders, MTI4.0, makes it easy to draw trendlines. The green line is a trendline and it makes it very easy to see that the market is making lower LOWS and lower HIGHS. We are in a downtrend.
Ths will would be a good time to sell first and buy later.
Can you see how the market moves in waves, up and down? Overall we are going down. The best time to sell is after we hit a high and we start moving down again.