In case if you are curious as to "what shall be a Sell signal?"
- The most "simple" method will be to use Heiken-Ashi Candlesticks; just lookout for a series of red-color candlesticks formation (in higher timeframes like the 1hr chart for example) - to have a confirmation for a Short.
- Another method is to use ZigZags (indicator); I personally use a series of custom ZigZags that defines the primary wave & also the secondary waves; so if the primary wave is down, then I can wait for a secondary wave to form upwards - to Short a upwards pullback/retracement/correction; for the main trade down (the primary wave direction). The ZigZags (2 sets) must be customized/set correctly, appropriately, & accurately.
- Another option is to use moving average(s) (which must also be set correctly, appropriately, & accurately). I personally use my own custom moving averages (such as the Non Lag Moving Average Version 6) on higher timeframes like the 1hr chart; together with the Heiken Ashi candlesticks if you need to.
Regards.