Niching down for a freelancer?

Hi folks. Bit of an unusual question. However, thought I may as well as the kind Webflow Community. :slight_smile:

So as per the title I’m looking to Niche down and target a specific industry. The industry I seem to keep coming back to is Marketing and Ad Agencies. More for their creative approach and out-the box attitude. But, I’m not sure if these Agencies would have their own ‘in’house’ web designers. I presume they may offer this very service as part of a package to their own clients? I did come across a few where there was mention of an independent designer. So left me confused.

Does anyone know have any experience with projects in this sector at all? Any light shed on this would be amazing.