“Congratulations” Page

Once a customer has completed their online course, we would like to have some sort of “Thank you” page letting them know they have completed the course. Something like “Congratulations! You have now completed this course”. Then underneath that, have an option to buy another course from there. Maybe some sort of a suggested next course, or an option to enroll immediately into another course. Would be great to have all of the courses they have not enrolled in listed on that Congratulations page for them to enroll in.

Please help in this regard. Thanks