I started offering vertical/niche targeted, high speed hosting recently. A group of us formed an agency. Really all the technology is generic - high speed hosting, Ontraport integration, buying traffic (Outbrain/Taboola/Facebook/Google) then providing messaging targeting specific verticals/niches.

For a good chance of success...

1) Inventory your skills.

2) Inventory niches where you have expertise.

3) Do an intersection of your skills + niches + whatever your niches pay the most for each month.

In our agency case, each principle had a specific skill set, which produced good synergy with other members.

This is a another consideration. If you come up with three high dollar items your niches pay for each month + you only have expertise in one item, joint venture with other people who possess these other skills + create an agency.