Is the US Stock Market Overvalued?

michael and tennessee, does need some advice? My wife and i have been maxing out our roths each year for a few years now. However, last year, during covid i got cold feet in moving our contribution from the fund's cash account into an actual low cost index fund. I've been predicting a significant market down turn for over 18 months now, but the market keeps going up. How should i remediate my cold feet behavior with last s contribution and now 20 21 that i'm about to make? Thanks for your guidance.