Do you still invest in s&p 500 etf despite knowing that it keep increasing the price? Don't investor feel not right whereby economy that bad in US, but still s&p 500 keep growing?

You can use the MSCI World or MSCI ACWI, or still an S&P500 ETF

there is no market timing possible, so periodically adding new into the

same primary asset allocation and holding for ultra-longterm seems a good idea

what to avoid, is written up here:

https://seedly.sg/questions/what-is-your-genera...

The stock market is not the economy. Really doubt that the stock market can be “predicted” or “timed” so the best time for you to invest is really now.