Depending on the hierarchy of you data, Power BI drill-down/up features can be used to analyze the underlying data for a given visualization or data point on a visualization. The first step is to look at visualization.
1. Does the visualization have the lowest level of detail showing or is it a summary when you right-click on visualizations?
Example
2. Can you hover and drill into to table?
3. Can you right-click and show data point as a table?
4. Can you right-click and show Table?
5. Can you right-click, drill-down and drill-up?
6. Can you Analyze the visual to explain the increase?