Add bar charts for non-timeseries data. For example, a bar chart of the top 10 uploaders overall in the last month, rather than a timeseries chart of the number of uploads per day for the last month.
Add basic tables and graphs for viewing things like uploads over time, new users over time, comments over time, etc. Located at https://betabooru.donmai.us/reports. The graphing uses Apache ECharts: https://echarts.apache.org/en/index.html.