the best indicator is the time when u don't feel like looking at the market anymore. because when u are still monitoring,it shows there's still hope. so when u feel hopeless, that's the time to buy.
President Trump is one of the best businessmen and market makers of this era. And I strongly believe he won't let a stock market crash under his administration.
$S&P 500(.SPX)$ if you are in for the mid to long term, ignore the tariff noise. Cause good company can and will navigate out of the storms. Remember, keep your eyes on the game, not on the scoreboard.
Any type of indicator or valuation is useless when we are heading into correction ( and probably bear market). One must believe in the company's future and direction, then we can hold the stock or buy more in whatever market condition.
Ultimately, it's your choice. A big loaf of bread, with Singapore government approved healthier choice, and a 1 liter milk should cost less than $10. I personally can survive 2 days (easily) from this combination. So it's your life, make your own choices.