Um, Vanguard Total Market was only down 21% by April 1 2020 and by June 30 2021 had gone up 76% from April 1 2020. Are you sure your tilts away from the market portfolio are helping? Buying the whole market can often be the best performer over the long haul and its tax efficiency and low fees are nice benefits too. Simple rebalancing when the market moves up and down would also avoid the need to outsmart your neighbor.
I think history will link the 2000 and 2008 crashes since after adjusting for inflation, the market never recovered to its early 2000 high until early 2013. Of course there are other examples of long downturns too like 1905-1921, 1929-1945 and 1966-1982. You might say that each period in-between downturns lasts approximately as long as investor's memories of the last crash.
I'd looked, especially, at the 1905 retiree:
they had two early difficult periods (the 1907 panic (
https://en.wikipedia.org/wiki/Panic_of_1907) where there was a 50% drop and the super high inflation of the early 20's)
they had the introduction of the federal income tax, which obviously caused additional stress on their withdrawals
and, obviously, they had the great depression at the tail end of the thirty year period
and, of course, there was no SS to supplement their retirement income as that was introduced well after their earning years so they wouldn't have been eligible
despite all that, they (barely) made it with a 4% wr (but bonds were paying a bit more during much of the time... there was the period afterwards where bonds in no way kept up, but much of that was post-war)
The way we dealt with early years of retirement was to have established a 5 year CD ladder that supplemented the pension. In our sixth year, we're about through with those...(have had below 2.5% wr)... and, unfortunately, with current CD rates a comparable ladder doesn't do much (might as well keep in a stable value type vehicle so as to keep access for whenever needed)... but also have a 45/55 allocation to reduce effect of down market before SS and a 3.5% wr of investments on top gives far beyond the minimum of 100% Firecalc...so all good.
{but I've also deferred past 62, so am able to start SS if the need arises...otherwise it'll be just past FRA or at 70}