Most courses online have terrible completion rates but the point is education. No other platform incentives for that KPI.

I have no idea how you'd do this besides Maybe Live courses, or somehow creating a social-dynamic between creator and consumer. This would be an invaluable vibe to cultivate to increase completion. Continuing to just throw ideas out, maybe you could give a % refund if you actually complete the course, or you earn back as you complete the challenges.