What can you do about a market event, correction or shock after the fact? The best course of action, is to view it as a learning opportunity, and take action to ensure your risk profile, investment strategy and asset allocation have all been determined correctly.
It’s important not to approach this in a knee-jerk manner. Rather, it requires you to do the legwork, re-evaluate your portfolio and its objectives soberly, and only make changes where they are clearly called for. It is also a good opportunity to consider changes to your portfolio to preserve capital by controlling downside risk.
Research has shown over and over that your own behaviour negatively impacts your returns over the long term.