I've been a Part 107 pilot a couple years now. Started doing work for local city government and non-profits tied to Parks and Rec divisions, and then moved into tourism-based short term rental marketing imagery... mainly photos, and I offer both the aerial stuff as well as traditional photography. It's been good so far, but I've never intended to support myself ONLY with the drone stuff.
To do THAT I think you'll need to really find the right market and service niche, the further removed from what more casual fliers can produce, the better. So things like thermal mapping, construction aerial photography, agriculture, search and rescue, etc. vs real estate photography, which is a saturated market.
Another option is to go cinematic support - provide aerial video and photos to small to medium production houses that don't have their own in house talent and rely on vendors. Get good at making contacts in the film industry - smaller video production companies are your leg up here. Prove yourself and the word will get around.