What to offer my client? (recurring projects)

I´m full time in the video scene for 3+ years. I have a client a client which we made an corporate movie for (11k€). They are a medium-sized industrial company.

Because we have a lot of unused clips left and they are in search for employees, I brought the thought about making videos for this.

But it feels like a finished end again. What I would like to offer is some recurring project but I have: A) no idea what could REAlLY help them B) how to price it

Now I´m hoping for your experience and knowledge on what to offer them so it won´t be a one time project again.