Obviously, the 57 flavors silliness can't last forevs, right? The first question is when will it fall?
A secondary question is what replaces it? That's the interesting thing because it might not be what we anticipate.
Ed McQuarrie talks the REAL History of Stocks and Bond performance.
https://www.morningstar.com/funds/vanguard-wellesley-income-is-top-choice
Could be a great fund to start with starting in retirement and cash. Or use Vanguard Wellington and cash if you want to be more aggresive
https://www.morningstar.com/economy/what-weve-learned-150-years-stock-market-crashes
Take a look at this what has happend in past in stock market