So quickly to wrap this up, a couple of points from the chart.
You can see where I marked a green X, represents a Buy-signal for Gold on this Daily MACD chart and there is even an exit strategy which is when the MACD Daily would be a blue MACD line crossing under the Red-Signal line. But best strategy is as the MACD line starts to slope down, exit position.
But of course this same strategy can be used for Shorts where Blue MACD line would need to Cross-under the Red-signal line.
There are disciplined high timeframe only traders who make shite-loads of money trading this simple strategy or combining with something similar. No need to backtest MACD, it works when applied properly in any market.