Build an ETF portfolio that could survive a crash

I am new to this and would like to start investing part of my salary in the stock market as early as possible. Given the current uncertainty and concerns about a potential market crash, I am considering increasing my share in international ETFs.

I understand that investing consistently over time is generally considered more effective than waiting for a market crash and trying to time the market.

I would appreciate your opinion on the following allocation:

* 30% in VOO
* 40% in international ETFs focused on the UK, Europe, or emerging markets, such as IEFA or IEMG
* 30% in cash