What did GCMS notes say.
So you explain why you must come to Canada to take this specific program, how you are expanding on current education (eg first Masters) and how the program will give you better job opportunities when you return, justify costs and explain how the program is so unique that it is not available anywhere and that the studies clearly show career and education progression.
You are coming to study not immigrate so you need to explain why coming to Canada is best for your career advancement. Hopefully it is a program that is not geared to international students and one of the many programs being cut like project/supply/project management. Those are programs where only international students attend and have no job opportunities here.