i'm no pro and my chart doesn't go back as far as yours but what i can see is that Gold had an inverse correlation to the trend of the global economy. Ok, that's not a new discovery. But it's also interesting to see a very strong inverse correlation between Gold and Yuan starting roughly in September 2017. Taking ECM into account might be worthy, especially for long-term predictions.
The xaucny chart is similar to xauusd but I think. It does not matter much for gold analysis.
Must rely on the original chart