I would work with local businesses where you can actually go into a business cold and sit down with someone. Anyone who owns a business is constantly getting hit up by Google Ads calls, people trying to sell SEO, merchant processing, etc. I think seeing someone face to face will instill more confidence and also seperate you from everyone else trying to sell them services.

Personally I might suggest focusing on dental offices. My girlfriend works for a dental office so I have some insights into their industry. At least in my area, ie Chicago suburbs, dentists are clueless about marketing, building websites, advertising, etc.

They all seem to go to these same conferences in Texas and they all share the same bad knowledge with each other. Her dentist is paying something like $250 a lead to 1-800-Dentist and the leads are absolute crap. That money put into even a short video ad which would do wonders to rank on Google as well as could be used in FB ads, Youtube Ads and other formats would be so much better spent IMHO.

I'm actually looking into starting kind of a full service marketing agency specializing in working with dentists ie building websites, handling their social media and PPC advertising, etc. I think video could be very powerful with them, especially since many people are fearful of dentists so showing a dentist in a more human way, personalizing them, showing a bit of their bedside manner I think would go a long way in converting video viewers to clients.