If you have taken this trade as per your trading plan, then don't worry about post mortem & treat this as just one fail trade and move on. You cant have all the trades right & its ok to have a wrong trade.
However, if u ask me, I wouldn't trade here. Here is why -
1/n
2. Moving average curve is flat & there is no momentum
3. Context (in the left) says that price broke recent swing low (point 1) but didn't sustain below it
2/n
5. Same thing happened in ur case. After short price didn't follow through which is a signal that it may not fall
3/n
4/4