Where you live might dictate some to your search. Here in the middle of 1,000s of acres of corn and soy beans, agriculture will be a growth industry. Surveying of crops. Also inspections of wind turbines, microwave/radio towers, even railway train systems. Commercial and residential property inspections or advertising photography.
Search the Internet for drone discussion groups focused on the commercial aspect rather than the hobby aspect. Less focus on Phantom style and quality and more on hex or octo devices capable of heavier payloads.
Find a way to get into the delivery aspect - Amazon for example. You just need to combine your skill set with an emerging field.