It looks like Google’s AMP project made big waves this week and rocketed to the top of the charts. When these things happen, we generally can find an interesting article or triggering event that precedes the trend: https://9to5google.com/2020/09/22/google-web-stories-wordpress/
In the Stable category we see SEO, more specifically Yoast, continues to occupy most WordPress administrator’s minds. Though WooCommerce in the age of COVID-19 makes a strong case as a continuing top plugin. So many new businesses being launched by out of work people.