I used this approach in 2008. I pulled back a lot. The problem is I really didn’t get back in until 2011 or so and really missed a big part of the run up. I’d have been better off staying in.
Not that history always repeats itself, but the point is that it’s very hard to time the re-entry.
The closer you are to retirement, the more you should consider pulling back. I have at least 15 years, so I’m riding it out, with about a 25% cash position in my retirement account(s).