Can you pull out a % into what. You suggested and let the rest ride?
As Zona notes, if you are looking at starting to take money out in 20 years, then you just ride the storm. I believe you make more money by protecting your retirement from market plummets like we saw in 1987, 2007, and 2015. Move the money to a safer investment and once the market has reached a low point, buy back in.
And you don't need to hit waves perfectly. If you sell on the downswing, but before hitting bottom, and buy on the upswing, but only after the market begins to rally, you still save a lot of money. I sold in January of 2020 because I believed the Chinese flu would hurt stocks, bought back in about November of 2020. Saved a lot of money. Sold out again in March of 2022, and again saved a hit.
When I moved the money to money market in 2022, the interest rate was abysmal - around 1.5%. Better than taking it in the shorts to the tune of 15%, however. Because of persistent inflation and rising interest rates, short-term rates are above 5%. Because I am retiring around March of 2024, I can put the money in 12-month money market/CD's. Not going to take it out before then.
As of March, 2024, I will still put the money in a fixed return account, but with the option of removing a certain percentage without penalty. The higher-rate accounts generally have longer terms and make the money inaccessible without some pretty bad penalties.