There’s an awful lot of corporate work out there and not just adverts and medical either, they need information delivered in a presentable format for trade shows, internal meetings and presentations, awards ceremonies, brand management etc. Then there’s crime scene recreations for courts which I know a few people love to be into. Any amount of motion graphics work. Product design and visualization, architectural visualization, scientific visualization, academic training materials, print work, advertising, exhibition design, illustration, online video channels, stings, idents and bumsettlers, simulations, kiosk design, sculpture (3d printing and other processes), fine arts, artist in residence, stage and light shows/backdrops for bands and musical arrangements, public art displays, teaching… pretty much if you can think of any way to make use of CG and animation skills then someone somewhere is making money doing it.
Just pick a field and start asking people what their workflows are for that field (or check the job postings to see what’s required). I think just knowing how to use Photoshop and After Effects well, Mograph etc will stand you in good stead if you’re just looking to spread your wings perhaps into the freelance trade.