Copy this framework. You can change it up a bit to make it sound unique and more like you.

Hi (first name),

The three biggest things you need to get leads for (their niche) are (thing 1, thing 2, thing 3).

We helped (person 1), (person 2), and (person 3) implement these and they got (result they achieved) in (timeframe).

I made a short 3-minute video going over the results. Mind if I send it over?

Talk later,

(Name)

(Company)

PS. (Authority building statement)