I think my strategy would thrive in a rerun of 2000-2003 and utterly fail in a rerun of 2008. But the bounce back (the 2009 scenario) would be massive.
I just ride to the bottom. My biggest percentage gain of the entire year last year came the day after my portfolio hit bottom. If I were to put some of my portfolio into cash at some point along the way down, I would have missed my biggest opportunity for gain.
Remain fully invested and ride it out. It has worked for me in three small-cap bear markets so far (February 2016, December 2018, and March 2020, in all of which the Russell 2000 lost more than 20% of its value). In none of those cases did I lose as much as the R2000, and in all three I walked away with major gains a few months later.