A Power BI consultant enhances decision-making processes by providing customized dashboards and reports that present critical data in a clear and actionable format. They help businesses identify key metrics and create visualizations that track performance in real-time, enabling stakeholders to make informed decisions quickly. Consultants also set up automated data refreshes, ensuring that reports are always up to date. By using advanced data modeling techniques and DAX calculations, they provide deeper insights into trends, opportunities, and risks, empowering decision-makers to respond proactively to business challenges and opportunities.