The solid blue line is a long term trendline from the top of the 2008 crash, which is also conveniently where the market topped out in October. Stoch RSI on the 4hr looking primed to go higher. If this provides support look for higher highs. If this support breaks look for 3480, 3450 and 3400 as the next few major supports.
Heavy volume at the left shoulder and head of pattern. With the all the volatility in the markets this pattern could play out for the gap fill/retest of ATH. Any consistent trading underneath the 270 level will invalidate this idea. Trade Safe!