Investing in US S&P500

Hi , I’m have been DCA-ing MYR3k/month into VOO via Moomoo.

My question here is, since this is a us stock, that means there will be a US withholding tax.

And that means it will be painful when my sum gets bigger and bigger.

I hope to find alternatives to invest in CSPX to avoid the US withholding tax.

Also I read that in cases of death, US stock takes 40% of total wealth?

Also is it safe to have $250K in VOO on Moomoo?

Makes me worried, but I don’t see any other method to invest apart from IBKR/ transferring somewhere else

What are your thoughts on this?