The lower graph is Bolinger Band Width, which is a measure of volatility. When we get very low volatility, it is a sign that a major trend is about to start.
If you look at Bitcoin just before it nosedived from 6k, you'll see the same story - a multi-month continuation pattern and a tightening volatility, here BTC went south, but as it is a continuation pattern it's debatable which way the trend will go for XRP.