SQL Developers transitioning to BI Expert roles should focus on mastering data visualization tools like Power BI, Tableau, or QlikView. They should also develop expertise in data modeling, ETL processes, and business intelligence concepts to excel in creating insightful reports and dashboards. If you are interested in getting into this field, then check out this video about Srinivas and how he became a PowerBI Expert after learning the Business Intelligence Masters Program from Intellipaat.