These sorts of outlooks are notoriously hard to predict.

Paul Tudor Jones (one of the most successful investors of our time) is of the mindset that if anything we are about to see equity appreciation far in excess of what we have seen for decades.

https://fortune.com/2025/10/07/paul-tudor-jones-hedge-fund-b...

If that's the case, right when you're looking to rebalance your portfolio, you're going to be looking at a much more difficult decision, having already missed out on price appreciation that would be quite useful in padding downside risk...

Perhaps just step away from market cap weighted index funds as a long term adjustment. That's something that with a proper basic framework is advisable as a general portfolio management approach as well. (I have some SMLF - Smallcap Quality/Value, Berkshire, generic Global Equity exposure, not for outright returns, but to lower exposure to the concentrated passive market cap weighted indexes and diversify risk exposures).

Trend Following exposure is a great add as well, since it is negatively correlated with risk assets in many macro/market regimes.

Probably healthier to address your very real concern with modifying the long-term portfolio design rather than take a short-term market timing approach which is more of a negative expected value.