Best move to protect 401k from a recession

4 years before retirement. I want to beat prevent a 30% loss in my nest egg.

I knew Trump would cause massive downturn in stocks. I rebalanced my 401k from various funds — primarily stocks, into the target date fund JPMCB SmartRetirement Passive Blend 2030 Fund-CF Class, which is available as an option. It more conservative, having nearly an even mix of stock, bonds and cash/t-bills.

Is this conservative enough to prevent a large loss? I’m afraid it’s not.

Put more in short term treasury bonds?

I wouldn’t have rebalanced if I had 20-30 years to buy more stock cheaper and build over time.