What can I offer clients who are already doing most things right?

Hi Everyone,

I am working with a client that teaches a very niche course in finance and they are the market leaders in teaching that course almost 70% candidates do the course from their institute their website also ranks on 1st positions for many course related keywords and they also have a very active blog with industry experts talking about their course they also have a very successful offline campaign for that course also.

My question is although they have so much going for them what else can be done to solidify their position in the market from an SEO point?