Should I put fixed deposits knowing that the market is gonna crash in the near future?

If you really know when it's going to crash, then you should buy an Inverse Tracker. Market go down x%, your fund goes up x%.

But I suggest not timing the market. We've been thinking market gonna crash since 2016.

You can pivot to a more defensive portfolio, but maybe try not to exit the market in total.

When is the crash happening?

You can park cash into Singapore savings bonds that has decent interest rates and 1 month withdrawal time.