Think again
https://www.schwab.com/learn/story/does-market-timing-work

Those who flee to cash in response to short term market losses (after the market has already gone down by the way, locking in losses) have a far lower balance by retirement age than those who simply buy, hold, and keep buying through thick and thin.

You've conceded you don't know much about investments, which is okay. The people who frequent this forum do, and are telling you to reconsider "going defensive", as it's a data-proven losing strategy.

Good luck