For most long‑term investors, pulling everything out of the stock market has historically cost more than it saved, because every S&P 500 fall of 10% or more since mid‑2016 regained its high and the best days came in the same weeks as the worst; the cases where reducing risk made sense were money needed within a few years, leverage or one oversized position, more loss than the investor could sit through, and a rule set in advance.
Pulling out is two decisions, not one. The sale is usually made in fear. The buy‑back has to be made while the news is still bad, which is when past rebounds started. Investors who get the first call right often get the second one wrong.
This is not a forecast and not personal advice. Whether to hold less in stocks depends on when you need the money and how much of a loss you can live with. The full set of options is in the portfolio protection guide. If the worry is the S&P 500 itself being top‑heavy, that is a different question: S&P 500 concentration.