Looking to invest 10k, should I invest all at once or over time?

As the title says, I have 10k which I am happy to invest. However, with this ai bubble and the potential crash coming, is it better to invest the money all at once now, or over time so if a crash does happen say when I’ve only invest 5k, I’m then getting cheaper prices for the next 5k? I know no one knows what’s gonna happen but any opinion would be greatly appreciated