In your situation, I would run to a "no penalty CD" before the banks can drop their rates. Yesterday, 30-year treasuries dropped to under 1% yield as the U.S. market plunged -8%. The Fed is probably going to cut rates again, which will lower what you earn in your savings account.
Banks tend to operate with certainty, so I think there's a small window of time where you can grab yesterday's CD rates before they change. That will be better than your savings account, and safer than being in the stock market.
But I wouldn't count the stock market out entirely. If you have mostly VTSAX, you can diversify into Vanguard Total International (VTIAX) which holds the rest of the world's stock. If that scares you, try to use 1/5th international. If you're braver, 1/3rd is okay too.