Trying to time the market is an “iffy” proposition at best. Rebalancing? Yes. Jumping into cash when there’s volatility? No. For example, if you invested your money during the time period of 1965-1993 95% of your returns would have resulted from just 1.2% of the trading days. The problem is…you have no way of knowing which ones of the days will be the best! During that time if you missed 90 of the best trading days your return would have dropped from 11% to 3%. Don’t guess, stay invested.