Catching the falling knife is interesting.

But, it is only thanks to people who try, that the knife stops.

That said, there are two places to enter.
When the value is worth well more than the price (IBM a long while ago)
or
When the bottom has already been reached, has made some recovery, and the overall pattern is bullish.

The problem is, there really is no support.
There really is no stock market.
And a pullback looks just like a market crash.