The trading formula in a downtrend is you must only open SELL orders.
There are 3 extremely important signals to watch out for: (1) Bearish reversal candlestick patterns, (2) The price breaks out of support to form a downtrend, (3) The price retests the levels in a downtrend. I will explain each signal so you can better understand it
Signal 1: Reversal candlestick patterns from bullish to bearish
The price will keep falling in a downtrend. Combined with bearish candlesticks, your trades will be a lot safer.