Diversification is less about owning many things and more about owning things that do not all fall together. Two funds with different names can hold much the same companies, and a portfolio can look spread out while behaving as though it is not.
Volatility is the price of the return, not a sign that something has broken. What matters is whether a fall in value forces you to sell something you would rather have kept, which is a question about your plan rather than about the market.
Most people come to us with a decision already in front of them rather than a portfolio question. A business is being sold, a parent's estate needs sorting out, or a child is buying a first home and the money has to come from somewhere.