Since the S&P500 bottomed over a period of four days (Aug 8-11), we have seen higher highs and higher lows (as is shown with the green parallel lines). The market needs to hold this level for it to go higher in the short term.
It is hard to be completely bullish at this stage. Bullish investors could think of the following strategy: Oct 1150/1250 Call Spread. This strategy is good as the Volatility is very high at this point.