Here a chart of S&P500 from late 1993 to late 2018 on a monthly chart as indicators for major pullbacks. MACD has fastest response, CCI next, DPO also good but laggard for people still holding.
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Some might also see wave 1, 2 and cresting 3.
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Await MACD cross-over and CCI nearing 0 for good market re-entry, but some stocks will be sooner than others.