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Everybody should decide what they should do since our objectives are different. For me,
AAPL - Do nothing since I am happy to just collect dividends and eventually let my children inherit it. Ofc, I would monitor the leadership, any signs of weak leadership I would let go all. The reason(s) they give for bad performance will tell you whether they are good or bad leaders.
S&P index fund - Continue to blindly DCA purchase regularly. The intent is to let my children inherit it.
Trading Portfolio - Well, I am trying out a new way of hedging. No sale of equities, just long inverse apparatus such as SPXU. I am net long so portfolio is red today. However, if the dive is epic like what Panda claims would happen, the SPXU would moon 
many times more than my original value of the trading portfolio. Don’t be unhappy that secretly I am wishing for that 