Gold fail

If I were long GC based on the previously mentioned premise (found here) then I would be out and waiting for a new long trigger.
Based on the 4-H chart (below, right) your first warning was the Fast Line crossing the Slow Line, your second warning was the fast line turning negative (red) and your final warning being the strong momentum after the 3rd fast line negative reading.  Given these "signals" if you were trading based off of this chart and it's signals, then you may have been able to exit at break-even .  I understand that can be perceived as hindsight bias, but these are the signals/triggers I look for personally.

At this point it is important that the Daily slow line supports the fast line (the 4H chart should re-orient to a fast line > slow line), otherwise it is looking rather bleak for a Gold long bias.