How do you get leads for social media management?

How do you get paying customers for your smma ? I've noticed that pitching lead generation services to technology companies works really well with good cold emails. Which companies or people are eager for instagram management or social media management in general ?

File lots of complaints to local companies through Twitter, then approach the company and say hey I saw you are getting lots of complaints. Need some help? I just thought of this. It's a free method exclusive for BHW.