If I had a nickel for every Black Monday prediction I've seen land in the trash can a week later, I'd have no fear of going broke when Black Monday finally arrives.
I managed to get myself on a mailing list for a contrarian stock newsletter that is always predicting that "The market has just signaled it's topping! Buy our newsletter to find out how to profit from the crash before it's too late!" They've been sending out that same sort of message for a couple years now.
Now, I'm a bit of a contrarian myself, but my conclusion is that nobody can really predict the top. Inevitably, somebody WILL predict the top, if only because a broken clock is right at least twice a day. But it won't be because they had actual foresight. I think it's clear that the market is overheated. But when will it break? That's the $1T question. I don't know. You could miss a lot of gains in the mean time, gains that will actually help buffer the downside when it arrives. IMO, rather than predicting the exact date, you should just approach the market daily on its own terms, taking it as it comes. And have a plan for how you're going to trade it to the downside when that finally arrives. Because it will. But I don't think anybody can tell you for certain when that will be.