Need help to create a large custom report of course completions

Need to create a report of all users who completed Learning Plans including mapped items which are LC courses and imported SCORM courses for past 6 years. Output data required includes Learning Plan or Course Name as well as completion date, and user data including name, address, and a few custom user fields. Having difficulty learning BI Custom reporting tool and the standard BI reports and Report Builder in Learn does not give me enough user data when I run a completion report.